17x self-centering, graduated drill do opening holes for equipment do woodworking Description: The centering drill consists of a high-speed steel drill bit and a hardened cover. High hardness, durability and excellent drilling performance. do hinge drill bits are available in 8 different sizes: 5/64", 7/64", 9/64'' x 2, 11/64'', 13/64'', 5 mm and 1/4". Use 1 hex key and 8 interchangeable drill bits. Automatic positioning center improves accuracy and efficiency. Double-sided hole design, fast and automatic sawdust ejection on both sides of the hole. Suitable do hinges, handles, drawer guides, woodworking, etc. When drilling, use low speeds (usually maintained at 2000R/min - 3000R/min). Too high a speed will cause it to lean out of the middle, resulting in a break in position or get stuck. Specification: Material: Stal high-speed The 17-piece suit is suitable do different scenarios. Size Chart: 8.6–11.2 cm /3.39–4.41 inch The package includes: 8-piece drill bits do hinges 1 sztuka hex key 8-Piece Replacement Drill Bits