Constructed for use with battery-powered drills and screwdrivers, Felo Allstar bit holder incorporates 2 rare earth magnets to hold 1/4 in. shank bits and screw securely in place. One magnet holds bit in place, while other securely holds fastener. It is available individually or packaged with bit assortment, all of which are machined from European chrome-moly-vanadium steel and heat treated.