Feature:1. RUST OR CORRODE RESISTANT TIP: This set of drills comes with 5 sizes, 5, 6, 8, 10, 12mm, to meet your various needs. Made of tungsten carbide tips that won't rust or corrode2. GOOD QUALITY MATERIAL: Made of cemented carbide material, this glass drill has very good wear resistance and extremely high hardness, possess long service life, Ti coated surface is resistant to oxidation and will not fade3. EASY POSITIONING AND FAST OPENING: The drill bit has neat and openings, no broken edges, no vibration, bring easy positioning, fast opening speed, and easy chip removal4. UNIQUE ANGLE DESIGN: Come with low incision resistance, stable drilling, fast speed, no edge breakage, neat opening, smooth, no edge breakage, no tremor, easy to break5. FOR VARIOUS MATERIALS: Professional glass carbide drill bit set provides and accurate drilling on tiles, marble, wood, sheet iron, mirrors and glass, etc.Specification:Item Type: Masonry Drill Bit SetMaterial: YG8CDrill Diameter: Approx. 5mm / 0.2in6mm / 0.24in8mm / 0.31in10mm / 0.39in12mm / 0.47inWorking Depth: Approx. 40mm / 1.57in44mm / 1.73in47mm / 1.85in52mm / 2.05in56mm / 2.2inShank Diameter: Approx. 6.35mm / 0.25inOverall Length: Approx. 72mm / 2.83in75mm / 2.95in76mm / 2.99in82mm / 3.23in85mm / 3.35in Package List:5 x Masonry Drill BitNote:Remember to add water or coolant when drilling continuously.