Features: *High-quality materials: Made of high-quality materials, fine workmanship, high hardness, high wear resistance, and can use for a long time. *No need to add water: This hole opener has a built-in cooling wax that can be drilled directly, and the drill body has a built-in dense cooling wax to cool and lubricate the drill bit without adding water. *Efficient drilling: The spiral-groove effectively prevents accumulated chips from being retained during high-speed operation, allowing smoothly chip removal and higher efficiency. *Wide range of applicable machines: The tail of the hole opener adopts a round handle design, which is suitable for hand electric drills and benchs drills. The clamping is stable and the work is convenient. *Widely applicable: suitable for openings in glass/full ceramic tiles/vitrified tiles/marble/ceramics/granites. Notice: 1.Actual color may be slightly different from the image due to different light effect 2.Please allow 1-3cm deviation due to manual measurement Process: Brazed-diamond Specification: 6/8/10/12mm Package List: 1 x Hole Drilling Bit