Scope of application: stainless steel, aluminum alloy, cast iron plate, copper, cast iron, plastic Scope not applicable: ceramic tiles, marble, wall, concrete, glass La Standard sharpening head cutting resistance is smaller and sharper U-shaped deepening groove is smooth and efficient New aluminum alloy non-stick knife quenching process Fashion Use: Twist drills are cutting tools and are mainly used for drilling metal, so it is very important to control the speed The recommended speed of this product: 100-800R / MIN, the larger the diameter, the slower the speed. Hardness of high speed steel twist drill bit containing cobalt M35 HRC64-66 degree, suitable for 38 degree Drilling metal, cannot drill hardened metal When working with manual drills, pay attention to the speed adjustment. If the speed of rotation is too fast, the bit may be damaged. Do not knock when using this product, the work needs to be repaired and the work oscillates during operation This will break the drill bit Drilling metals with high hardness and many impurities, the speed is slower than normal drilling, and cooling effect is better For products with large processing thickness, if abnormal cut, please remove debris in time. This product can be ground and the company can provide technical support for sharpening. Scope: 30MM square steel, galvanized square pipe, commonly used aluminum alloy door and window profiles, 304 stainless steel continuous perforation without heating, various commonly used angle irons, various mahogany, various wood, plastics, etc. External cutting edge angle (): 118 Material: high speed steel Category: Straight Shank Twist Drill Series: Ground drilling rig M35 Model: 8.0mm10pcs Store Tips: 1. The size is manually measured, please allow the error (1-3cm). 2. Due to the different monitor pixels, there may be some color difference, please refer to the actual product.