Feature: 1. Made of high-quality hard alloy for good performance, it can make clean and accurate holes for you. which works as a set of glass drills which are very easy to use. 2. The cutting resistance is small with stable function, and the drilling speed is fast, also the boundary is not damaged. 3. Neat opening, smooth, no folds, no tremor, such hand drill accessory can work for easy chipping. 4. Professional glass and tile drills are for smooth, accurate drilling of tiles, marble, porcelain, mirrors and glass. Triangular design reduces drill breakage. And the drill has a carbide tip to extend drill life. 5. Widely applicable, it can be installed in ordinary electric hand drills, bench drills, impact drills, etc. And machine drill clamp range is 10mm and above. Specification: Item Type: Drill bit Material: 45 steel inlaid alloy blade Surface Treatment: Titanium plating Scope of Application: Glass, ceramics Size: Tool Diameter: Approx. 4mm / 0.16in Approx. 5mm / 0.2in Approx. 6mm / 0.24in Approx. 8mm / 0.31in Approx. 10mm / 0.39in Approx. 12mm / 0.47in Length: Approx. 74mm / 2.91in Approx. 75.4mm / 2.97in Approx. 74.2mm / 2.92in Approx. 76.6mm / 3.02in Approx. 82.4mm / 3.24in Approx. 84.4mm / 3.32in. Package List: 6 x Drill Bits Note: 1. When cutting or drilling, remember to add water to the material to prevent the material from overheating.2.Dimensional error for ± 2mm