This product is made of high quality material with high hardness, wear resistance and more sharp. Suitable for thin wood(1-2mm), thin iron, plastic, aluminum sheet, etc. Features: Made of high quality material with high hardness, wear resistance and more sharp. Surface finishing grinding processing, effectively improve the hardness and wear resistance. Sharp head design, facilitate drilling positioning, resistant to wear and tear. Big groove design for high speed running fast chip removal. High hardness, wear resistance and more sharp, performing well in cutting and drilling. Ideal for DIY, home and general building and engineering using. Suitable for thin wood(1-2mm), thin iron, plastic, aluminum sheet, etc. Specifications: Material: High Speed Steel Color: Gold Shank Type: Round Handle Cooling type: External cooling Cutting diameter: (mm) 3-8 Handle diameter: (mm) 3-8 Ruff length: (mm) 30-55 Useful length: (mm) 30-55 Total length: (mm) 60-95 Top angle of outer edge (): 45 Maximum depth: 55mm Blade size: 3-8mm Blade diameter: 3-8 (mm) Blade length: 3-8 (mm) Total length: 60-95 (mm) Shank diameter: 3-8 (mm) Item weight: 73g /0.16lb Package weight: 75g /0.165lb Package size: 120*50* 20mm /4.72 *1.57*0.79in Note: Due to the light and screen difference, the item's color may be slightly different from the pictures. Please allow 1-3cm differences due to manual measurement. Package List: 1*3mm Twist Drill 1*4mm Twist Drill 1*5mm Twist Drill 1*6mm Twist Drill 1*6.5mm Twist Drill 1*8mm Twist Drill