Features:Brand new and high qualityFour piece set includes bits for drilling location holes for screw sizes 3mm, 4mm, 5mm, 6mm.Special designed steel counter sleeve countersinks or counter bores location hole.Adjustable counter sleeve depth with wrench.Drill and countersink for wood screws without changing bits.Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew.Chamfer is 5 flutes,In the process of using, can discharge the wood more rapid,Sink hole disposable drilled smooth, screw cap perfect embedded in thesurface of workpiece.Specifications:Model: HSS Drill 4241Color: SilverMaterial: Chamfer Drill: steel 45; Bit: HSS 4241Dimension:3mm x 60mm(L)4mm x 75mm(L)5mm x 85mm(L)6mm x 93mm(L)Dia. of Chamfer: 15.8mmShank: 1/4 hex shankPackage includes:4 x Woodworking chamfer(3mm,4mm,5mm,6mm)1 x 1/4 Hex Shank