Trend QR/DBG/SET Quick Release 3 Piece Drill Bit Guide Set The Trend QR/DBG/SET Quick Release x3 Pc Drill Bit Guide Set is ideal to use on on timbers and boards, using in quick chucks and impact drivers. FEATURES 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 SPECIFICATION Shank Diameter: 1/4\" Hex Diameter: 2.4 mm (3/32\") Diameter: 2.8 mm (7/64\") Diameter: 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)