Ivy Classic 44852, 1/2" Impact To 1/4" Hex Driver, Mega Magnetic Impact Driver Adapter, 2 powerful magnets create 40x the pulling power of an ordinary magnetic bit holder. Magnet #1 holds and magnetizes the bit while magnet #2 powerfully holds your fastener in place! (See illustrations). Designed to withstand the high torque of impact drivers. Works with all 1" insert bits. Chrome molybdenum steel body. For rotary use only. Patented in the USA.