Specifications: The straight shank twist drill has double relief angles to reduce drilling resistance, reduce heat, and make the drill more durable. It is rolled by a fully automatic hot rolling mill, and is wear-resistant. This product is used in soft metals such as plastics, woodworking, aluminum, and copper. Name: Twist Drill Bits Product Material: 4241 High Speed Steel Quantity: 13Pcs/Set Features: Wear-resistant, Durable, Hex Shank Size: 1.5mm/0.06", 2mm/0.08", 2.5mm/0.10", 3mm/0.12", 3.2mm/0.13", 3.5mm/0.14", 4mm/0.16", 4.5mm/0.18", 4.8mm/0.19", 5mm/0.20", 5.5mm/0.22", 6mm/0.24", 6.5mm/0.26" (Approx.) Notes: Due to the light and screen setting difference, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 13 x Twist Drill Bits