4pcs 3mm-6mm HSS Countersink Drill Bit Set Reamer Woodworking Chamfer Drill Counterbore Pliot Hole Cutter Screw Hole DrillFeatures:1. Four piece set includes bits for drilling pilot holes for screw sizes 3mm, 4mm, 5mm, 6mm.2. Special designed steel counter sleeve countersinks or counterbores pilot hole.3. Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew.4. Chamfer is 5 flutes, In the process of using, can discharge the wood more rapid, sink hole disposable drilled smooth, screw cap perfect embedded in the surface of workpiece.Specifications:Material: High Speed SteelShank: Round Shank4pcs Set Including: 3mm 4mm 5mm 6mm+1pc Wrench7pcs Set including: 3mm 4mm 5mm 6mm 7mm 8mm 10mm +1pc WrenchNotePlease allow 1-3mm error due to manual measurement.Due to the difference between different monitors, the picture may not reflect the actual color of the item.Package Including:1 Set Countersink Drill Bit