68mm Diamond Hole Saw, Diamond Drill Bit with Center Guide Drill Bit, Tile Hole Saw with Diamond Surface Coating for Cutting

【PRECISE POSITIONING】: Compared to traditional glass hole saws, our hole saws have positioning aids. The pilot drill in the center helps you position yourself precisely, ensuring the drill bit won't slip or jam, and helping you drill accurate holes.【CUTTING EFFECT】: The diamond surface coating uses a sintering treatment method. The cutting edge contains diamond particles from the inside out to guarantee it remains sharp. Low cutting resistance and stable drilling create smooth, high-precision cuts without broken edges for optimal cutting results.【HIGH-QUALITY MATERIAL】: The diamond hole saws are made of industrial-grade, high-strength carbon steel, and the surface is nickel-plated, which is effective against corrosion and rust. The drill bit's diamond surface coating is thick and uniform, improving wear resistance and extending the hole saw's lifespan. 【CHIP REMOVAL DESIGN】: The cutting head of our diamond drill bit features a notched design with clearance holes on the side, facilitating the entry of cooling water and ensuring that chips and other particles escape from the drill hole during operation, allowing for more convenient and efficient drilling. 【WIDE APPLICATION】: The diamond drill bit is suitable for cordless drills, lithium-ion drills, and bench drills. It is widely used for cutting precise holes in glass, ceramics, porcelain, tile, limestone, slate, marble, pumice stone, and fiberglass.