Feature: 1. Fast Change: Hex arbor is suitable for fast change of drill bits and any drill bit, screwdriver or screw gun 2. Firmly Inserted Into The Driver: The 1/4in fast change hex nut driver is firmly inserted into the driver and can be used immediately 3. Long Service Life: Made of chrome vanadium steel material, with corrosion resistant coating on the surface, bring long service life 4. Strong Magnetization Design: Adopt strong magnetization design, when used with an impact wrench, strengthens the safety lock and lock of the nut and bolt fasteners 5. For Electric Drilling Tools: The total length of the adapter is 48mm, and the adapter nut is M8 hex nut, suitable for electric drilling tools Specification: Item Type: Power Nut Driver Material: Chrome vanadium steel Purpose: Tapping die holder adapter Adapter Handle Type: Hex handle Adapter Handle Size: 1/4in Adapter Total Length: Approx. 48mm / 1.89in Adapter Nut: M8 hex nut Adaptation Tools: Impact wrench, electric drill, etc.. Package List: 10 x Power Nut Driver1 x Storage Box