_x000D_ _x000D_ Specification: Name: M35 5% Cobalt HSS Step Drill Bit Material: 5% Cobalt High-Speed Steel Drill bit shank: Hex shank Size: 4-12mm (4-5-6-7-8-9-10-11-12mm) 4-20mm (4-6-8-10-12-14-16-18-20mm) 4-32mm (4-6-8-10-12-14-16-18-20-22-24-26-28-30-32mm) HSS M35 5% Cobalt CoatingHigh speed steel along with cobalt coating ensures outstanding durability and sharpness, can reduces the friction. Requirement M35 Cobalt High Speed Steel is more suitable for hardening materials. Ideal for cutting stainless steel, steel and cast iron as well as wood, aluminum alloys and other softer metals. Not suitable for glass or ceramic materials. Not applicable to high carbon steel and heat treated steel. Pay attention to speed, pressure and heat control when drilling. Structural DesignWith the step drill bits we offered, machining holes of different diameters saves a lot of trouble.Drill metric sizes: 4mm-20mm, the difference between each layer is 4mm.Split point tip at 118 degrees for added abrasion resistance. The dual edge design provides a smoother cut and allows material particles to easily escape for a cleaner drilling operation. EfficiencyThe double-edged design keeps metal filler from flying around and clears chips faster, so you can drill more smoothly without heating. SERVICEIf you have any problem with our metric drill bit set or are not satisfied with the product, please feel free to contact us. _x000D_