Utoolmart 1pcs 100mm/3.90 inch Diamond Drill Bit Hole Saw for Tile Glass Marble Granite Fiberglass Ceramic Tool Colorful

Nickel plating on these bits maximizes your tools life with great resistance to corrosion Small incision resistance, increase the speed of cutting holes, easy to decorate and clean after grooving Durable Each hole is treated with smooth and accurate surface treatment, and the top on the hole is thickened to achieve excellent cutting strength Features Opening neat-smooth, no broken edge, incision resistance is small and the hole speed is very fast, easy chip evacuation High Quality Material Diamond hole saw is made of carbon steel and coated with nickel to resist corrosion; Diamond drill bit creates a high precision, smooth cut with no broken edges; Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably