Description: Five piece set includes bits for drilling pilot holes for screw sizes The applicable scope is suitable for workpiece under 25 HRC hardness, such as carbon steel, sheet iron, insulation board, PVC board, wood, etc. Adjustable counter sleeve depth with Allen wrench,drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew 5 Sizes in one drill bit set which meet your different needs perfectly. Standard hex shank is quick change compatible,drill and countersink for wood screws without changing bits. Specification: Material : Steel Color: Black Size: Approx. 2.38mm/0.09inch; 2.78mm/0.1inch; 3.18mm/0.13inch; 3.56mm/0.14inch ; 3.97mm/0.16inch Package Includes: 5 pieces Countersink Drill 1 piece Chamfering Drill Note: Due to the difference in the measurement , pls allow an error of 1 to 3mm
