Countersink Drill Drill Screw Reamer Set 1/4-inch Shank Screw Reamer Chamfer Countersink Drill Quick Drill Cone Bit Set 5pcs Hss Countersink Drill Cone Bit Shank Quick Set 1/4 Shank

5pcs HSS Countersink Drill Cone Bit Set 1/4-inch Hex Shank Quick Change Taper Drill for Woodworking Screw Carpentry Reamer Chamfer Milling Adjustable counter sleeve depth with allen wrench and 1/4 hex shank is quick change compatible. Adjustable drilling length for various length screws simply by loosening and tightening screw. 6 piece set includes 5 bits for drilling pilot holes for screw sizes #5 #6 #8 #10 and #12 and 1 hex wrench. Pre-drilling and countersink to drive screws flush with material surface or deep hole counter boring for driving screw headsbelow surface. Drill and countersink for wood screws without changing bits very convenient. Special designed HSS steel counter sleeve countersinks & counter bores pilot hole. This 5pcs countersinks are suitable for drilling less than 25HRC hardness workpieces such as carbon steel sheet iron insulation board PVC board hard woods wood etc. They can drill out sunk holes for screw while drilling screw hole andkeep them on same axial also suitable for drilling machines with collets or adapters. Specifications: 6# 56mm / 2.20  Package Weight: Approx. 73g / 2.57oz 10# 64mm / 2.52  6# 2.38mm / 0.09  Shank: 1/4 (6.35mm) Hex Shank Countersink Sizes: #5 #6 #8 #10 #12 Package Size: Approx. 7 * 5 * 1.1cm / 2.78 * 1.97 * 0.43in 8# 61mm / 2.40  Countersink Length: Material: Carbon Steel + High Speed Steel (HSS4241) Hardness: HRC 60 Quantity: 5 pcs Drill Bits + 1 pc Small Wrench 5# 54mm / 2.13 12# 3.56mm / 0.14 8# 2.78mm / 0.11  10# 3.175mm / 0.125  Color: Silver + Black Chamfer Diameter: 10mm / 0.39 5# 1.98mm / 0.078 12# 69mm / 2.72 Countersink Diameter: Item Weight: Approx. 71g / 2.50oz (6pcs set) Package List: 5 * Countersink Drill Bits 1 * Hex Wrench