Small high-performance countersunk Neodymium (N42) magnets available in North and South pole on the countersunk face.
Ideal for furniture fixings, hanging artwork and keeping doors and drawers closed, countersunk magnets have a central hole which allows them to be fixed to non-magnetic surfaces with a screw.
If your project requires magnet-to-magnet application, use North pole with South pole magnet to avoid the magnets repelling.
Ordered these to see if they could detect studs in partition walls. They work perfectly. I inserted a small screw through the hole which makes them easier to handle. I now see that they do make magnets in skittle shape which are possibly even better for the task. With a pack of 10 magnets it took me about 3 mins to identify all the studs in a dividing wall. Expensive electronic detector is still trying!!!
I purchased North and South 10 mm diameter magnets which are predrilled with a 3 mm hole so were perfect for my intended use.