1,High speed steel material twist drill bit with straight shank, sharp spiral groove 2,Double ended drill bits, a bit can be used as two ordinary bits, long service life 3,Sharp and twisted drill bits will make the drilling easier and more effortless 4,Drill with extremely sturdy construction, used in portable hand tools, particularly for cordless drill 5,Suitable for drilling thin wood, iron, aluminum, etc. If drill stainless steel, thickness should be less than 0.4mm Description: These drill bits are made of high quality high speed steel which are durable and ensures a long service life. With double ends, they can be used as two ordinary bits. They are used on cordless drills for drilling wood, iron aluminum or other soft metals and thin stainless steel. Features: High speed steel material twist drill bit with straight shank, sharp spiral groove. Double ended drill bits, a bit can be used as two ordinary bits, long service life. Sharp and twisted drill bits will make the drilling easier and more effortless. Drill with extremely sturdy construction, used in portable hand tools, particularly for cordless drill. Suitable for drilling thin wood, iron, aluminum, etc. If drill stainless steel, thickness should be less than 0.4mm. Specifications: Material: HHS4341 Diameter: 3.0mm, 3.2mm, 3.5mm, 4.0mm, 4.2mm, 5.2mm(optional) Length: 48mm, 46.5mm, 48mm, 52mm, 53mm, 55mm(approx.) Quantity: 10pcs or bag Package Includes: 10pcs x Drill Bits Note: 1. Please allow 1-2mm length error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.