4pc/set Hand Tap Drill Bit Hex Shank HSS Screw Spiral Point Thread Metric Plug Drill Bits M3x0.5, M4x0.7, M5x0.8, M6x1 FULI 6 in 1 adjustable tap wrench tapping screw thread metric plugs tap set m3 m4 m5 m6 m8 straight flute hand screw thread