Each Tile Hole Saw with a Removable Center Guide Bit--No Special Guiding Tools Needed NO DRY DRILLING. Add water cooling to extend bit life. 1 1/4" Diamond Hole Saw with Triple-Layer Diamond Coating for Enhanced Performance Cutting Depth: 1 3/8 inch - Increasing Hole Saw Body Height for Deeper Cuts Triangular Shank - Standard 3/8" Shank for Standard Drills Solid Steel Body - Smooth, Precise, Clean and Fast Cuts Every Time Drill Through 1.5 inch Thick Countertops, Marble, Granite, Ceramics & Porcelain Tiles, Glass and Light Stones 1 1/4 Inch (32mm) Diamond Hole Saw with Pilot Bit, DaduoRi 1.25 Inch Tile Hole Saw with Center Drill Bit for Marble, Granite, Ceramics,Porcelain Tiles, Glass