You can magnetize a screwdriver to keep screws in place, so why not magnetize your sockets, too? These Brocket magnetic socket inserts hold nuts and bolts captive so you don’t have to worry about them falling out and rolling into hard-to-reach places.
Made in the USA, the nickel-plated neodymium magnets are embedded in a hexagonal plastic housing that fits snugly inside each of your sockets. They work with 1/4″, 3/8″, and 1/2″ drive sockets. The SAE set includes nine inserts for 3/8″, 7/16″, 1/2″, 9/16″, 5/8″, 11/16″, 3/4″, 13/16″, and 7/8″ sockets, and the metric set includes ten inserts for 10mm-19mm sockets.
You’ll pay about $10 for either the SAE or metric set, or you can have both sets for $18.