Metric Taper Plug Tap Tapping Drill. Multi-use Drill Tap Deburr Countersink Hex Bit Kit. Drill/Tap Bit Tapping, Deburring And Countersink Bit. Drill/Tap/Countersink Set, Metric, 6 Pc. Drill/Tap Bit. Hole Drilling, Tapping And Deburring/countersinking. Back Tapered Beyond Tap To Prevent Thread Damage From Over-drilling. Deburr/countersink Also Provided On Bit Beyond Back Taper. Specification: Material : High Speed Steel 4341 Shank : 1/4 IN Quick Change Hex Metric 6PC:M3 M4 M5 M8 M6 M10