● Self-locking design, quick replacement and loosening of the screwdriver bit, no cumbersome steps, and fast ● The extension length of 60 mm is very because it makes it easier for you to manipulate the electric drive around the workpiece ● Specially designed for 2.36 " hexagon shank drill bits, suitable for the transfer of electric drills, screwdrivers, drill bits,, expanding various screwdriver bits and screwdriver bit conversion applications ● Stainless steel has resistance and durability The sturdy structure makes these expansion devices have a long service life ● 60mm 2.36 " hexagonal shank screwdriver handle, which can be easily used with any chuck, hand-held screwdriver or electric drill, Manufacturer: kmgfsd