3pcs/Set Hss Titanium Step Drill Bit Set With Hexagona - Sizes 3-12mm 4-12mm 4-20mm

3pcs HSS Titanium Step Drill Bit Set Cone Hole Cutter Taper Metric Titanium Coated Metal Hex Core Drill BitsMaterial: HSS SteelFinish: TitaniumColor: GoldenSize: Type 1: 3-12MM+4-12MM+4-20MMType 2: 4-12MM+4-12MM+4-20MMType 3: 3-12MM+3-12MM+4-12MMType 4: 3-12MM+3-12MM+4-20MM4-12mm, 4-20mm, 3-12mm4-12mm Length: Approx. 6.8cm/ 2.67" (4mm, 6mm, 8mm, 10mm, 12mm)4-20mm Length: Approx. 7.3cm/ 2.87" (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm)3-12mm Length: Approx. 7.4cm/ 2.91" (3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm)3Pcs HSS drill bit set, quality tool for jobs of all sizesMade from high quality HSS steelStrong durability: HSS + titanium durability.Avoiding the inconvenience of a tri-flat shank to ensure a firm grip.Easy drilling: Two-fluted design provides faster, smoother cutting.Automatic center punch: Delivers an automatic, high-impact, spring-loaded strike when pressed against surface, adjustable cap regulates striking force.Titanium coated to reduce friction and heat3 sided shanks design in order to prevent slippage when in chuckTwo flute design provides faster, smoother and cleaner cuts each step is clearly labeled with the depth diameter in steps Ideal for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc.Wide usages: Mark hole locations and start drill bits and screws, preventing wandering, heat treated alloy steel punch with sharp precision tip, corrosion-resistant brass body with non-slip knurled grip.