Features: Twist drill bits are made from high speed steel for high hardness and durability. There are 25 pieces drill bits in many different sizes of the most popular drill bits. They are great for most drilling jobs and materials such as aluminum, wood, plastics. Incisive twisted drill bits will make the drilling easier and more effortless. There are 2 colors you can choose--the gold color ones have titanizing coating, while the black ones do not. Specifications: Color: Gold, Black (Optional) Material: High speed steel 4341 Type: Twist drill bit Size: 1mm / 1.5mm / 2mm / 2.5mm / 3mm / 3.5mm / 4mm / 4.5mm / 5mm / 5.5mm / 6mm / 6.5mm / 7mm / 7.5mm / 8mm / 8.5mm / 9mm / 9.5mm / 10mm / 10.5mm / 11mm / 11.5mm / 12mm / 12.5 mm / 13mm Weight: 689~765g(approx.) Package Includes: 25pcs x Drill Bits