BephaMart 4pcs HSS Countersink Drill Bit Set Counter Bore Screw Woodworking Tool Shipped and Sold by BephaMart This 4pcs woodworking countersik drill bit set has excellent workmanship and durability with titanium-coated HSS.The drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew with the adjustable counter sleeve depth design ideal for less than 25HRC hardness workpieces countersinking, such as carbon steel, sheet iron, insulation board, PVC board, wood, etc. Specifications: Material: HSS Drill 4241(Titanium-coated)