Welcome toFNGZ ， I wish you a happy ！ Cutting Carpenter Side Cutting Tap Spiral Saw Drill Bit Woodworking Hole Tool Main FeaturesIndustry grade 6542 high-speed steel drill bit set, harder than 4241 HSS used in other similar drill bits set. These drill bits also contain 5% Cobalt, which increases wear-resistance and durability.Fully ground spiral groove design quickly decreases friction and heat for a faster and cooler drilling performance. 135-degree split point with straight shank prevents walking and makes drilling precise and faster. No center punch is needed.Suitable for Cutting Hard Metal such as Stainless Steel, Steel and Cast Iron as well as Wood, Aluminum Alloy, and Other Softer Metals, including tiles, concrete, tiles, bricks, wood, plastic, glass, masonry and more. The product has sharp edges and high drilling efficiency. The center of the product has sharp serrations, and with its help, the drill can continue to drill horizontally after drilling.Suitable for holing, cutting on wood, soft metal, aluminum plate, iron, etc.Materials:High-Speed SteelPackage Contents 3mm × 14mm × 15mm × 16mm × 16.5mm × 18mm × 1NoteWhen drilling hard materials (glass, ceramic tiles, marble or granite), lubricate with water.etc. Due to manual measurements, please allow slight measurement deviations.Due to the different display and lighting effects, the actual color of the item may be slightly different from the color displayed on the picture.