5PCS HSS Drill Bit Countersink Wood Drill Bit Set Cordless Step Drill Bits for Metal Woodworking Durable

Description: Four piece set includes bits for drilling pilot holes for screw sizes #5, #6,#8,#10 and #12Special designed steel counter sleeve countersinks or counter bores pilot holeAdjustable counter sleeve depth with Allen wrenchStandard hex shank is quick change compatibleDrill and countersink for wood screws without changing bitsDrilling length can be adjusted for various length screws simply by loosening and tightening the setscrewSpecifications:Color: black SilverMaterial: HSS Drill 4241Black chamfer drill body material: steel 45Dimension:5# 1.98mm(0.07795 inch)x 50mm(L)6# 2.38mm (0.0937 inch) x 55mm(L)8# 2.78mm (0.1094 inch) x 60mm(L)10# 3.175mm (0.125 inch) x 63mm(L)12# 3.56mm (0.14 inch) x 65mm(L)Shank: 1/4 hex shank