Features: Taper handle twist bit, material strength, choose high speed steel material, durable and wear-resistant; Grinding head, drilling centering, high precision, sharp cutting; Large groove structure, large space for seedlings, good chip discharging performance; It can greatly improve work efficiency.01Specifications:Material: HSS high-speed steelMachining Process: QuenchingApplication: used for drilling copper, iron, aluminum, steel and other materialsShank Diameter: 12.7mm/0.5inchBlade Diameter: 13mm/0.51"Size: 180*13*13mm/7.09*0.51*0.51"Weight: 130g02Specifications:Material: HSS high-speed steelMachining Method: quenchingApplication: used for drilling copper, iron, aluminum, steel and other materialsShank Diameter: 12.7mm/0.5" Blade Size: 14mm/0.55"Size: 190*14*14mm/7.48*0.55*0.55"Weight: 150g03Specifications:Material: HSS High Speed SteelMachining Process: QuenchingApplication: Used for Drilling Copper, Iron, Aluminum, Steel and Other MaterialsShank Diameter: 12.7mm/0.5inchBlade Diameter: 15mm/0.59"Size: 210*15*15mm/8.27*0.59*0.59"Weight: 250gNote: Use a hand drill with a clamping capacity of about 13mm/0.51"Notes:1. Due to the different monitor and light effect, the actual color of the item may be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-3cm measurement deviation due to manual measurement.1 X Twist Drill Bit