12pcs Stepped Drill Bit Set, Titanium Coated Alloy Steel Tap And Die Set, 4-20mm, 4-12mm, 3-12mm Stepped Drill Bits, 3mm, 6mm, 8mm Saw Tooth Drill Bits, Combination Drill Bits - Metric Thread Taps And Dies For Woodworking And Metalworking, Suitable For Manual, Factory, Workshop, DIY