Specifications:These twist drill bits are perfectly suitable for hole drilling on iron, copper, stainless steel, aluminium, steel and other materials.It can serve you for a long time with the dual end design and high speed steel material.Special R angle on the head, which provides accurate positioning, high hardness, stronger performance.Item Name: Twist BitsMaterial: High Speed SteelModel: 3.2mm, 4.2mmQuantity: 10PcsFeatures: Dual End, Twist Bit, Heavy DutySize: 5.5cm x 0.42cm x 0.42cm/2.17 x 0.17 x 0.17 (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:10 x Twist Bits