Why Choose Rierdge Rierdge focus on retail and wholesale hardware items and other accessories. The design and optimization of all products are based on customer opinions and suggestions. We are keen to communicate with customers to create better products to give back to customers. So we are very happy that you actively communicate with us and give suggestions after purchasing our products. 1. If you're looking for a hole saw, Rierdge presents you this saw. It's designed for deep-cutting applications, working greatly and more easily than using a jigsaw. 2. Hole saw may become overheated and get damaged or even burned up due to fast rotary friction, we suggest customers to use coolant (Not Includes) to keep the hole saw cold during usage. 3. Start drilling with a slow drill rotary speed, or the center bit may be shattered on first use. 4. Not for brick, ceramic, hard glass, engineering plastic, thick sheet iron, Hardi board, cement board, and other hard material. Specification Material: High-Speed Steel & Bi-Metal Color: Matte Black Surface Treatment: Silicon Carbide Coating Cutting Diameter: 6-1/4 inch / 159 mm Cutting Depth: 1.3 inch / 32 mm Arbor Shank Diameter: 0.5 inch / 12.7 mm Hole Saw Arbor Length: 4.57 inch / 116mm Drill Bit Length: 2.85 inch / 72.5 mm Drill Bit Shank Dia: 0.25 inch / 6.3 mm Package Content 1 x Hole Saw 1 x Heavy Duty Arbor 3 x Drill Bit Guarantee Service We are committed to providing you with the most cost effective and quality and reliable products, as we believe this is a priority and contribute to a satisfactory purchase. If there is any question, please feel free to contact Rierdge at any time. And we will solve your problem as soon as possible.