Quick release 1/4 inch hex shank for use in quick tool change drills. Accurate self centred pilot hole drilling for hinges and lock face plates. Use on timbers and boards. High Speed Steel (HSS) drlll bit for longer life. Sprung loaded to ensure drill bit retracts safely. Easily dismantled for cleaning and drill bit replacement. Use in quick chucks and impact drivers.Specifications• Shank Diameter=1/4 inch hex• D=2.4 mm (3/32")• D=2.8 mm (7/64")• D=3.6 mm (9/64")• Screw size=No.6 (3.5 mm)• Screw size=No.8 (4.0 mm)• Screw size=No.10 (5.0 mm)Contents• 1 x Drill bit guide 3/32"• 1 x Drill bit guide 7/64"• 1 x Drill bit guide 9/64