Specification length1 4 3 8 1 2 5 8 inch UseWood DrillingMaterialHigh Carbon SteelDIY SuppliesWoodworkingModel NumberWood Plug Cutter DrillTypeCore Drill BitInch specifications1 4 3 8 1 2 5 8 inch Metric specifications6mm 9mm 13mm 16mm ColorAs the pictures showBlack chamfer drill body materialsteel 45Features Four piece set includes bits for drilling pilot holes for screw sizes 5 6 8 10 and 12 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 setscrewPackage Included 8 X HSS Cork Drill BitsDetail Pictures