These seriously strong, neodymium boride magnets have hundreds of repair and building uses around the shop. They're 1/8" (3.18mm) thick, nickel-plated, and are available individually in 1/2" (12.70mm) and 1" (25.40mm) diameters and with a countersunk hole for attachment to tools or clamping cauls. See our instructions for using them in your repair work.
For building or repairing guitar pickups, you can use a pair of 1" (25.40mm) magnets to magnetize a pickup or change its polarity. Single-coil Kit instructions tell you how.
See details below