Alloy cutter head: The blade is made of alloy, combining inner and middle. The outer three-edge and front-to-back inclination angle design has low cutting resistance and high hole-opening efficiency. Center positioning/precision drilling: Grinding center positioning drill, positioning before drilling, equipped with discharge spring, to ensure accurate, fast and stable cutting and opening. Optimized chip removal design: The newly upgraded large chip removal, supplemented by special chip removal holes, smooth chip removal and effectively prevent chipping due to chip blocking. Anti-slip triangle handle-blessing and fastening: the triangle handle type, the blessing is more firm, not easy to slip, making the opening more safe and reliable. Purpose: It can be used to open holes in stainless steel, thick cast iron, thick steel plate, aluminum alloy and other non-standard metals. Suitable model: Suitable for hand drills, rechargeable drills, bench drills. Specifications: Product name: Drill Bit Color: Silver Material: Carbide Tipped Working depth: 25mm/0.98inch Size: About 14mm/0.55inch, 16mm/0.63inch, 18mm/0.71inch, 19mm/0.75inch, 22mm/0.87inch, 25mm/0.98inch, 30mm/1.18inch Package Included: 1PC x Hole Saw Drill Bit 1PC x L wrench Note: Transition: 1cm=10mm=0.39inch 1. Due to the light and screen difference, the item's color may be slightly different from the pictures. 2. Please allow 0.5-2 cm differences due to manual measurement.