3-Pack M35 HSS Cobalt Step Drill Bits, Titanium Coated Spiral Groove Design, 29 Sizes Available, Suitable for Drilling Metal, Aluminum Plate and Wooden Workpieces

【M35 Cobalt High Speed Steel】

The durable step drill is made of HSS M35 cobalt (Hardness 364HRC), and the surface is plated with cobalt，outstanding durability and sharpness. Effectively reduces the friction to ensure cooler running so as to prolongs service life.

【Spiral shape】

 The spiral groove design reduces the pressure during cutting and improves the discharge of chips. Compared to the straight type, it has superior durability and excellent stability when rotating, which greatly improves the removal of debris and cooling efficiency.

【Total 29 Step Sizes】

3 drill bits, 29 sizes, our drill bit set includes 3 standard step drill bits, capable of drilling 29 holes of different diameters, thus saving your time and effort.

【HSS titanium coating】

The surface is treated with a titanium alloy, which greatly improves the cutting performance of the drill bit, is more wear-resistant, and extends the service life. 135°X split point tip and two-flute design increases cutting speed with self-centering and prevents walking, clears chips faster and allows particles to escape easily.

【Application】

Super hard metal，Iron, stainless steel, hardened metal, mild steel, galvanized steel, aluminum, copper, plastic, wood，resin etc。The drill step bit suitable for pistol drill or bench drill, cooling water to extend its service life.