Specifications:This center drill can be drilled on die steel, stainless steel and other metals. Made of high quality material, it is durable, wear-resistant, heat-resistant and of long service life. Designed with enlarged chip area, it is conducive to high-speed operation and accelerate chip removal. Item Name: Center Drill Material: High-speed Steel Features: Portable, Durable, Easy to Use Size: 1mm: Shank Diameter: 4mm/0.16", Blade Length: 1.6mm/0.06", Overall Length: 34mm/1.34" (Approx.) 2mm: Shank Diameter: 5mm/0.2", Blade Length: 2.3mm/0.09", Overall Length: 40.6mm/1.6" (Approx.) 3mm: Shank Diameter: 8mm/0.32", Blade Length: 4.6mm/0.18", Overall Length: 50mm/1.97" (Approx.) 4mm: Shank Diameter: 10mm/0.39", Blade Length: 6.6mm/0.26", Overall Length: 56.2mm/2.21" (Approx.) 5mm: Shank Diameter: 12mm/0.47", Blade Length: 6.7mm/0.26", Overall Length: 63.3mm/2.49" (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: 1 x Center Drill