Step Drill Bit HSS Titanium For Metal Multiple Hole Drilling Cone 4mm to 12/20/32 mm Stepped Up Bits DIY Lovers (4PCS Spiral Grooved Set)

🔥 YOKOCUT step drill bits are 100% genuine HSS 4241. 100% Satisfaction Guarantee: Every YOKOCUT product includes 60days money-back & 24-month warranty and a friendly customer service. 🔥 Perfect Step Drill Bits suitable for drill holes in various material： within 3mm/0.12 inch (Iron Plate, Copper Plate, Aluminum Plate); within 5mm/0.2 inch (Wood, PVC sheet, Insulation Boards). Not suitable for hard and brittle materials such as stainless steel, glass, tile floors, walls etc. 🔥 HSS combined with a titanium coating. More capable and durable. 🔥 Two-Flute Design for smoother cutting. High Step design let you feel the stop and never drill bigger in mistake. 🔥 3-Piece HSS Spiral Groove Step Drill Bit (4-12/ 4-20/ 4-32mm ) + 1 Automatic Center Punch. 1/4" Hex shaft drives are suitable for all kinds of for home DIY power drills.