6pcs/lot Cobalt Drill Bit Set Saw Drill Woodworking Drill Saw Tooth Drill 3-8mm Drill Bit Screw Metric Composite Tap Drill BitProduct name: Woodworking drill bit serrated drill Product weight: about 85g per set Product material: high speed steel Product size: diameter 3-8mm, length 50-94mm Note: one: 6 most commonly-used sizes to satisfy all your needs. This drill bits set fits the majority of power drill currently on the market and come with a portable plastic bag for easy storage and organization. two: 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. When 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.