HSS Step Drill Bit Sets, 4Pcs Titanium Step Core Drill Bits w/Automatic Center Punch, 2 Fluted Edge Stepped up Bits 1/4" Hex Shank Step Cone Bits DIY Woodworking Metal Drilling Bit Hole Saw Cutters

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About HSS Step Drill Bit Sets, 4Pcs Titanium Step Core

Sets Step Drill It can be widely used, it can drill thin iron plate, aluminum, insulation board, PVC board that the thickness is within 5mm. With a drill, you can drill different holes of sizes High-speed steel 4241 (suitable for the workpieces that the hardness is under 25 degree).The drills are HSS titanium coated.With 4 sets 5 stage + 9 stage + 10 stage + 11 stage step drills 5 step drill bit: 4-12mm (4mm, 6mm, 8mm, 10mm, 12mm) 9 step drill bit: 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm) 10 step drill bit: 3-12mm (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm) 11 Step drill bit:3-13mm (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm ) Automatic Center Punch Before starting drilling and screwing, the Automatic Center Punch can be used to mark hole locations. It delivers an automatic, high-impact, spring-loaded strike when pressed against wood, metal, and plastic surfaces. An adjustable cap regulates striking force. It features a heat- treated alloy steel punch with a sharp precision tip and a corrosion-resistant brass body with non-slip knurled grip Package content: Parallel drilling * 4 Automatic Center Punch * 1 Note: The colors may be different from the picture as the difference display. Please understand