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This High Speed Steel Hex Shank Machine Tap Drill Bits Set comes with 5 Bits ranging in size form M3 - M8 HSS Machine Screw Thread Metric Plug Tap Machine Screw Thread Metric Plug Tap Metal Cutter HSS Great for machine tapping, iron, steel, copper and aluminum, especially for processing stainless steel. The straight screw tap is suitable for the stainless steel finely processed or other materials. Type Size: M3: 3mm*0.5mm(Pitch) M4: 4mm*0.7mm(Pitch) M5: 5mm*0.8mm(Pitch) M6: 6mm*1mm(Pitch) M8: 8mm*1.25 mm(Pitch) Thread Dia: 3mm 4mm 5mm 6mm 8mm