Size ---- 1PC drilling bit, Diameter 1-1/8''(28mm), Total Length 2-3/8''(60mm), Workable Length 1-1/8''(30mm), Diamond Height 5/8''(15mm), Connection 5/8''-11'' Thread. Vacuum Brazed Technology ---- High-quality diamond powder with strong steel body can bring excellent working performance & longer working life (usually 3-5 times), more durable and wear-resistant than electroplating technology. Multiple Application ---- Can drill holes in Porcelain Tiles, Hard Ceramic Tiles, Granite, Marble & Engineered Stones, and also be used to notch edges of tile to accommodate for pipes or wiring. Function ---- This 1-1/8'' dry diamond core drill bit is a great tool for cutting holes for split AC units plumbing, shower/tub grab bars, shower plumbing, faucet, garbage disposal button, gas forge and more projects. Wide Compatibility ---- Suitable for any hand-held 5/8''-11'' thread angle grinders , and dry or wet use both ok. Dry Diamond Core Bit