Description:1.AAA Grade diamond particles coated cutting tip offers sharp and efficient cutting.2.Nickel plated surface makes it more durable. Segmented design works better and lasts longer.3.Specifically for glass openings. Excellent results in , and tile.4.Cut holes smoothly, tidily, without broken edges and vibration phenomenon.5.Small incision resistance, increase the speed of cutting holes, easy to decorate and clean after grooving.Attentions:1.This glass hole saw needs to be used at a low speed, about 800-1000RPM.2.In order to prolong the life of this glass hole saw, please add coolant liquids or water when processing. Do not working without cooling.3.Please start your hole diagonally, make a round trace and then hold drill straight.