GooDeal 10pcs 6mm Diamond Coated Core Drill Drills Bit Hole for Saw Tile Glass 1/4" Inch Shipping from our USA warehouse, fast shipping and good service. 100% brand new and high quality. The diamond coated hole saw suitable for use in drill hole on glass, marble, tile or rock. The size is 6mm outside diameter and 5.47mm shank, can drill 30mm deep. Gross Weight: 68g