Features Practical drilling accessories - This product is a soldered hole opener set that is used to make holes in tiles, marbles, etc. Wide range of applications - The drill is suitable for perforating solid ceramic tiles, stoneware tiles, marble, granite, microcrystalline stone, ordinary glass, ceramic, quartz stone and other materials. Solid integral forging - The drill has undergone an integral forging treatment that makes the overall structure of the drill more stable and firmer and no chattering occurs when drilling. Durable emery grinding surface - The drill grinding surface is made of emery. The emery is electroplated and quenched at high temperature, which has high hardness, sharpness and durability. Solid cooling wax bit - The inside of the drill is treated with sealing wax, which can cool to a certain extent during the drilling and cutting process and realizes the function of drifting, so that the drill can be used for longer time. Functions: UNIVERSAL ROUND SHANK The shank of the drill bit has a round design, making it suitable for most electric drills and angle grinders. Scope of application: it is suitable for perforating full ceramic tile, stoneware tile, marble, granite, microcrystalline stone, ordinary glass, ceramic, quartz stone and other materials. Specifications: Product Type:Hole Opener Bit Product material: brazed diamond Punch diameter:5mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm Punching depth: ≤ 30 mm. Sanding surface width: 7.5 mm/8.5 mm. Shank Diameter 4mm, 5mm, 8mm, 7.5mm Total length: 65 mm. Package type: Plastic box Gross weight of the product: 10/12/18/21/27/29/33g. Package size: 8 x 3 x 3 cm. Packing list: 1 x 5 mm emery drill. 6 mm emery drill x 1. 8 mm emery drill x 1. 10 mm emery drill x 1. 1 x 12 mm emery drill. 14 mm emery drill x 1. 16 mm emery drill x 1 Package List