Material:High Speed Steel Type:Countersink Drill Bit Use:Wood Drilling Description: Five 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 setscrew Specifications:Color: As the pictures showMaterial: 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 shankSpecification: Package Weight One Package Weight 0.09kgs / 0.19lb One Package Size 10cm * 10cm * 8cm / 3.94inch * 3.94inch * 3.15inch Qty per Carton 144 Carton Weight 12.53kgs / 27.62lb Carton Size 52cm * 52cm * 41cm / 20.47inch * 20.47inch * 16.14inch Loading Container 20GP: 240 cartons * 144 pcs = 34560 pcs 40HQ: 558 cartons * 144 pcs = 80352 pcs