[High Quality] Made of hard alloy, this glass drill bit has excellent abrasion resistance and extreme hardness for longer life, titanium coated surface is antioxidant and does not fade.[6 sizes] Glass drill bit with 6 different sizes: 3mm, 4mm, 5mm, 6mm, 8mm, 10mm, all with 1/4 \" hex shank fits perfectly for various tasks, this drill bit is marked with dimensions.[Precise and smooth hole] Excellent for making clean and precise holes in glass and tile. The fine edge and hole are smooth and complete, without burrs.[Robust and durable] The glass drilling tools with hex shank are fast and fast. Use of water lubrication significantly extends the life of the tip.[Wide range of uses] Indispensable for DIY enthusiasts and home improvers for drilling ceramic mirrors with glass plates and other rigid and fragile work surfaces.Specifications:Material: rigid alloy.Dimensions: 3mm (Length 69mm), 4mm (Length 70mm), 5mm (Length 76mm), 6mm (Length 76mm), Length 77 mm), 8 mm (Length 78 mm), 10 mm (Length 83 mm). Hex shank diameter: 6.35 mm. Quantity: 6 pieces