Feature:1. [13PCS IN 1 SET] The set includes 13pcs spade drill bits, with different processing widths to meet various needs.2. [DRILLING MATERIALS] The incisive spade drill bits can accurately drill most wood, fiberglass, PVC, aluminum and other soft metals.3. [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.4. [HIGH CARBON STEEL] The spade bit is made of high carbon steel, the head surface is polished, and heat treated to improve durability.5. [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 BitMaterial: High Carbon Steel + Pine Wooden BoxLength: Approx. 150mm / 5.9inShank: 1/4in Hex Shank (6.35mm)Width: Approx. 6mm / 0.24in8mm / 0.31in10mm / 0.39in12mm / 0.47in13mm / 0.51in14mm / 0.55in16mm / 0.63in18mm / 0.71in20mm / 0.79in22mm / 0.87in25mm / 0.98in30mm / 1.18in35mm / 1.4in.Package List:13 x Flat Bits1 x Storage Box