Features: 1Double rear angle design incisive cutting head rapid drilling and high efficiency. 2Eddy current chip flute smooth high temperature resistant non sticking to the knife. 3The size models are clearly engraved on the round stem making it easy to see. 4Used for perforating ceramics glass ceramic tiles concrete and wood. 5High-quality YG8 hard alloy durable in use and has longer service life. Specification: Item Type: Drill BitsMaterial: YG8 Hard AlloyColor: As shown in the picture4MM Product Length: Approx.88mm / 3.46in5MM Product Length: Approx.94mm / 3.70in6MM Product Length: Approx.100mm / 3.94in8MM Product Length: Approx.105mm / 4.13in10MM Product Length: Approx.116mm / 4.57inWeight: Approx. 125g / 4.4ozModel: 4MM 5MM 6MM 8MM 10MMApplication: Used for perforating ceramics glass ceramic tiles concrete and wood. Package List: 1 x 4MM Drill Bit1 x 5MM Drill Bit1 x 6MM Drill Bit1 x 8MM Drill Bit1 x 10MM Drill Bite Note: 1. Please allow 1‑2in 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.