Features [13PCS IN 1 SET] --- The set includes 13pcs spade drill bits, with different processing widths to meet various needs. [DRILLING MATERIALS] --- The incisive spade drill bits can accurately drill most wood, fiberglass, PVC, aluminum and other soft metals. [1/4IN HEX SHANK] --- The 1/4in hex shank can be easily and safely installed on most power tools for locking and fast change chucks. [HIGH CARBON STEEL] --- The spade bit is made of high carbon steel, the head surface is polished, and heat treated to improve durability. [CUTTING EDGES] --- The cutting edges of these drill bits have double sided cutting burrs for easy, durable and fast drilling. Specification: Item Type: Woodworking Flat Bit Material: High Carbon Steel + Pine Wooden Box Length: Approx. 150mm / 5.9in Shank: 1/4in Hex Shank (6.35mm) Width: Approx. 6mm / 0.24in 8mm / 0.31in 10mm / 0.39in 12mm / 0.47in 13mm / 0.51in 14mm / 0.55in 16mm / 0.63in 18mm / 0.71in 20mm / 0.79in 22mm / 0.87in 25mm / 0.98in 30mm / 1.18in 35mm / 1.4in Package List:13 x Flat Bits 1 x Storage Box Package List 13 x Flat Bits 1 x Storage Box