Pool Cleaning Brush Pool Corner Cleaning Brush Pool Hand Cleaning Brush HSS co M35 step drill bit, higher quality and more durable than HSS 4241 step drill bit. High-speed cobalt steel combined with titanium coating ensures extreme durability and will remain shiny as new for years to come. Hexagonal shank diameter: 6.35 mm. No center punch required, less likely to break than ordinary twist drill bits, can be used for deburring, chamfering and opening holes. HSS co M35 step drill bit, higher quality and more durable than HSS 4241 step drill. Can be used as a premium cobalt drill bit. Made of extra-tough HSS steel, it is more durable and has a longer service life. Non-walking drill bits can drill holes quickly and smoothly on steel plates, aluminum plates, wooden plates, plastic plates, etc. (The thickness of the plate should be less than the height of the step drill). Size: 4-20mm Features: Material: High Speed Steel, Cobalt (HSS co M35) Surface Treatment: Titanium Coating Hexagonal Shank Diameter: 6.35mm / 1/4 Size: 4-20mm (4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm); 9 Steps Features: Titanium coating reduces wear and heat. HSS co M35 step drill bit, better quality and more durable High efficiency punching, an excellent cobalt drill bit. Great for drilling, especially in stainless steel, metal, plastic and wood. Suitable for drilling holes in metal plates, steel plates, aluminum plates, brass or wood Highly recommended tools for use in the workshop About nesting of stainless steel plates: 1. When nesting stainless steel plates, you can use hand drills and bench drills. Hand drills can drill holes in steel plates within 1mm, and bench drills can drill 2-3mm steel plates 2. When nesting stainless steel plates, you need to drill holes at a low speed, a few hundred rpm will do. 3. Please pour water to cool when punching to extend its service life. The recommended speed is 250-400. Note: -When drilling, please wear protective measures to prevent wood chips from splashing. -The size is measured manually, there may be an error of 0-3mm, which is normal. -The knife is sharp, please keep away from children. -Due to the differences between different monitors, the picture may not reflect the actual color of the item. Packing List: 1 * Hexagonal Shank Step Drill Bitco M35