5 Types of Kitchen Sinks, and How a Magnetic Holder Fits Each
For a magnetic holder, the material of your sink decides most of it. The product pages for the HAPPY SiNKS® Magnetic Dishcloth Holder say it works in steel and metal sinks, and in composite sinks with a thin enough wall, and that it is not suitable for ceramic or stone sinks. For those, and for cast iron, we recommend the Magnetic Holder Adapter. Below are 5 types of kitchen sinks, what each one is made of, and what to check before you order.
What are the main types of kitchen sinks?
This guide sorts kitchen sinks by material, because material is what sets how a magnetic holder fits. The table is the short version, and each row has its own section underneath. How the sink is installed in the counter gets a section of its own after the five types.
| Sink type | Made of | Holder setup, per our product pages | Check first |
|---|---|---|---|
| Stainless steel | A steel alloy; the family varies | Works in steel and metal sinks | A magnet test in a few spots |
| Granite or quartz composite | Crushed stone bound with acrylic resin | Works directly when the wall is thin; the adapter when it is thick | Wall thickness |
| Fireclay and other ceramic | Shaped, fired clay | Not suitable on its own; use the adapter | That the sink is ceramic and not enameled metal |
| Porcelain-enameled cast iron | A metal body under a fired, glass-like coating | We recommend the adapter | The maker's label or manual |
| Natural stone | Solid stone | Not suitable on its own; use the adapter | Whether it is solid stone or composite |
Stainless steel sinks
Some stainless steel sinks attract a magnet and some barely do. According to the British Stainless Steel Association information sheet on magnetic properties (issued May 2000), ferritic, martensitic and duplex stainless steels give a strong pull on a hand-held magnet, while austenitic stainless steels give a negligible one. The same sheet says cold working can add some pull to an austenitic steel, usually at sharp corners and sheared edges.
Our product pages list the holders as working in steel and metal sinks, so a steel sink is the easy case. A quick magnet test tells you which family you have, and our guide to whether a stainless steel sink is magnetic walks through it.
Granite and quartz composite sinks
With a composite sink, wall thickness is the number to check. BLANCO's published FAQ for its granite composite sinks (page copyright 2026) describes the material as up to 80% natural granite, in the form of quartz sand, mixed with acrylic resin. That is one maker's description of one material, so read it as an example rather than a rule for every composite sink.
Our sponge holder page lists composite sinks with a wall of 3 mm (about 1/8 in) or less. The dishcloth holder pages give 3 to 5 mm (about 3/16 in) or less. The limits differ a little between holders, so read the page of the one you plan to buy. Past those limits the magnets cannot connect through the wall, which is the situation the Magnetic Holder Adapter page describes. A ruler at the rim of the basin, or at the edge of the tap hole, gives you a quick reading.
Fireclay and other ceramic sinks
A ceramic sink is made of clay, which is not a metal. The American Ceramic Society describes ceramics as nonmetallic, inorganic materials, and lists sanitaryware among the traditional ceramics found in everyday objects. That covers fireclay and other ceramic sinks, which have a clay body instead of a metal one, so the wall has no metal for a magnet to take hold of.
Our holder pages list ceramic sinks as not suitable on their own, and the adapter page names porcelain among the surfaces it is made for. The adapter is a small piece you stick to the inside wall of the sink, on a dry surface after peeling the adhesive backing. The holder then goes on the other side of it, and you are done.
Porcelain-enameled cast iron sinks
An enameled cast iron sink is a metal body under a glass-like coating, and for this type we recommend the Magnetic Holder Adapter. Vibrantz, a maker of porcelain enamel materials (page updated July 2026), says its enamel is sprayed on steel and fired to fuse into a durable coating, that its ground coats are generally for steel but also used on cast iron, and that enamel is chosen for sinks and bathtubs.
A white, glossy sink can be solid ceramic or enameled metal. The maker's label, manual or order confirmation usually settles which. If you cannot tell, send us a note with the brand and model.
Natural stone sinks
A solid stone sink is on the list of surfaces our holders do not suit on their own. The holder pages say not suitable for ceramic or stone sinks, and the adapter page names stone, granite and porcelain among the surfaces it is for. The setup is the same as for ceramic: adapter on the inside wall, holder against it.
Does it matter how the sink is installed?
Yes, because the holder's magnet normally goes on the underside of the sink wall. Our installation guide has you attach the magnet to the underside of the sink, arrow facing upwards and outwards, after peeling the adhesive sticker, and then place the holder inside the sink, lined up with it. If you cannot reach that spot, the Magnetic Holder Adapter page gives farmhouse and undermount sinks as examples, and the adapter goes on the inside wall instead.
Which way the magnet faces is worth a second look. Customers have told us that a holder which sagged under a wet cloth settled once the magnet was turned around, and it costs nothing to try.
How do I find out which type of sink I have?
- Look for the maker's label, manual or order confirmation. It often names the material.
- Try a small magnet on a dry patch of the wall, then lift it away instead of dragging it. A firm pull points to a magnetic metal. No pull does not name a material on its own, since austenitic stainless steel, ceramic and stone can all give none.
- Measure the wall where you want the holder, at the rim or at the edge of the tap hole.
- Check whether you can reach the underside of the wall.
- Pick the setup: the holder alone for a steel or metal sink, or for a composite sink within the thickness limit, and the holder with the adapter for the rest. If you are unsure, send us a note with your sink type. When a holder will not stay put, the sink is the first thing our support team asks about.
The adapter is not listed in every country's store. If you do not see it where you shop, write to us with your sink type.
Quick answers
What are the types of kitchen sinks by material?
This guide covers five: stainless steel, granite or quartz composite, fireclay and other ceramic, porcelain-enameled cast iron, and natural stone.
Will a magnetic holder work on a composite sink?
It can, if the wall is thin enough. Our sponge holder page lists a wall of 3 mm (about 1/8 in) or less, and the dishcloth holder pages list 3 to 5 mm (about 3/16 in) or less. For a thicker wall, use the Magnetic Holder Adapter.
Do I need the adapter for an undermount or farmhouse sink?
If you cannot reach the underside of the wall, yes. The adapter page lists farmhouse and undermount sinks as examples of that situation.
Is a ceramic sink magnetic?
Ceramics are nonmetallic materials, according to the American Ceramic Society, so a magnet has no metal wall to grip. Our holder pages list ceramic sinks as not suitable on their own, and we recommend the Magnetic Holder Adapter for them.
The short version
Steel and metal sinks, and composite sinks with a thin wall, take a HAPPY SiNKS holder directly. Ceramic, natural stone and cast iron take it with the adapter. Check the material, measure the wall, and see whether you can reach the underside before you order. Next step: see the Magnetic Dishcloth Holder in steel. The biocomposite version and the Magnetic Sponge Holder in steel are the other options, and steel and biocomposite are two materials to choose between. If you are weighing ways to hang a cloth without drilling, our guides to the no-drill dishcloth holder and why people choose magnetic sink accessories cover the wider picture.
More from the blog
- Magnetic vs Suction Sponge Holders: Which One Is Better?
- Scandinavian Design for Sink Accessories
- What Is a Swedish Dishcloth? The Complete Guide to Using and Caring for One
Browse every guide on the HAPPY SiNKS blog.
Written by The HAPPY SiNKS Editorial Team. Last reviewed 10.07.2026.
