3Pcs HSS Spiral Step Drill Bit Set, 1/4" Hex Shank High Speed Steel Titanium Coated Cone Hole Cutter Bit with Automatic Center Punch for Drilling Plate Aluminum Metal Wood Hole (4-12mm/4-20mm/4-32mm)

Key features

• 【Widely Used】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.
• 【Material】HSS combined with a titanium coating. More capable and durable. Coated by titanium,this step drill set performs well in heat,corrosion and rust resistance.
• 【Easy Drilling】Two-Flute Design for smoother cutting. High Step design let you feel the stop and never drill bigger in mistake
• 【SET INCLUDES】Bit #1 (9 steps): 4-12mm (4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm,12mm); Bit #2 (9 steps): 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm); Bit #3 (15 steps): 4-32mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm,30mm,32mm)
• 【Package Included】 3-Piece HSS Sprial 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.