Feature 1Fit for drilling holes in marble, concrete, granite, tiles, glass and others, this diamond hole drill bit keeps high pratcicality. 2Supports smooth drilling without seamless, this hole opener keeps strong hole opening performance to support fast drilling speed. 3And hole drill bit keeps high practical adoptability with high performance, which can be used with confidence. 4Made of high‑quality diamond material, such hole drill bit keeps high hardness and durability. 5High‑quality diamond brazing technology helps drill bit of sharpness tooth edges to support smooth openings without broken edges , no vibration. Item Type: Hole drill bitColor: BlueMaterial: DiamondSize: Approx. 73 x 10mm / 2.9 x 0.4inHole Diameter: Approx. 10mm / 0.4inUses: Fit for drilling holes in marble, concrete, granite, ceramic tiles, glass, etc. Package List 4 x Hole Drill BitNoteManual weight measurement, please allow an error of 1‑3mm, thank you for your understanding.