The BCC4DCS is a strong block magnet with the added benefit of having two countersunk holes- one on each side of the magnet. This enables this mighty magnet to be attached to surfaces such as wood, aluminum, stainless steel, etc. And it's reversible, so it can be oriented either north-side-up or south-side-up with the exact same results.
See our full line of Countersunk Magnets
This size is also available without the countersunk hole as part number BCC4.