About This Tough Dry Diamond Hole Saw ??drilling perfect 3-1/2" Diameter holes in soft wall tiles and very hard floor tiles such as Porcelain, Ceramic Marble, Granite tiles, Natural Stone High Quality Diamond Drill Bits ??Vacuum brazed diamond (height 15mm) for fast and smooth cutting and longer lifetime; Slot in the side for easy removal of debris; Max working depth 2" Fit Most Angle Grinders ??Hole Saw Bit is built with a female 5/8-11 thread can attach directly to most popular angle grinder Easy to Use ??This diamond core drill bit is sharp and quick; you can let the diamond hole cutter do the cutting job, no extra pressure is required; just move the tool in a swiveling motion to remove the debris and prevent diamond from wearing out User Tips ??Start the tool at a high speed between 10,000 and 14,000 rpm, let the bit touch the tile in a 45-degree angle to get position slot, then bring the tool up right slowly and move in circle motion; If it's getting too hot, dip in water or stop to cool Overview Material : Ceramic,Diamond,Marble,Porcelain Brand : DKIBBITH Color : Black Style : Compact Item Weight : 0.58 Kilograms Compatible Devices : Angle Grinder