Description:1.Cutting tip with AAA Grade diamond particles coated offers sharp cutting, the efficiency of cutting will be improved greatly.2.Nickel plated. make it more durable than the general hole saw,segmented design works better and lasts longer.3.Specifically for glass openings.excellent results in ,and tile.4.Cut holes smoothly, tidily, with out broken edges and vibration phenomenon.5.Small incision resistance, increase the speed of cutting holes, easy to decorate after grooving and easy to clean.Attentions:1.This glass hole saw needs to be used at a low speed, about 800-1000r per minute.2.In order to prolong the life of this glass hole saw, when processing, please add into coolant liquids or water.3.Working without cooling is forbidden.4.Please start your hole diagonally, make a round trace and then hold drill straight.