Description Perfect Drilling Tool - The sharp spade drill bit allows for precise drilling in most types of wood, as well as fiberglass, PVC (polyvinyl chloride), and soft metals such as aluminum. These drill bits provide expert drilling for large holes in wood with a flat head and strong center point. Durable and practical drill bit tool - The spade bit set is Made of high carbon steel, with heat treatment for durability, head with polished surface for durability. Cutting edge with high quality double sided cutting spurs for durable and fast drilling without effort. Universal power tool compatibility - The 1/4 inch hex shank of the bit fits easily and securely in all power tools and is specially designed to lock into a quick-change chuck. What You Can Get - Our Set spade bit set includes 13 bits: 1/4 (6mm), 5/16 (8mm), 25/64 (10mm), 15/32 (12mm), 13mm, 35/64 inch (14 mm), 5/8 inch (16 mm), 45/64 inch (18 mm), 25/32 inch (20 mm), 55/64 inch (22mm), 1 inch (25 mm), 1 3 /16 inch (30 mm), 1 3/8 inch (35 mm). Product Name: FDS Handle Drill Material: Steel high carbon Uses: Recommended Wood Specifications: 6 10 14 18 20 (MM)*230 (MM)