6pcs Countersink Drill Woodworking Drill Bit Set Drilling Pilot Holes Description: Four piece set includes bits for drilling pilot holes for screw sizes 6, 8, 10, 12and 14 Special designed steel counter sleeve countersinks or counter bores pilot hole Adjustable counter sleeve depth with Allen wrench Standard hex shank is quick change compatible 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 Material: HSS Drill 4241 Black chamfer drill body material: steel 45 Dimension: 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) 14 3.97mm Shank: 1/4 hex shank Package included: 5pcs Woodworking Drill 1pcs hex shank