Aopin Diamond Drill Bits Hole Saw 4mm-5-32inch- for Glass Ceramics Porcelain Marble Carbon Steel 2Pcs

Diamond Drill Bits, suitable for perforating glass, ceramic tiles, floor tiles, marble. These diamond drill bits made of high-speed steel that is durable and have a long sevice life, which are high quality and good performance that excellent for high accurate hole. Operation: 1. Install the hole saw on hand drill or rechargeable drill. 2. Since this kind of hole saw does not have a centrally positioned drill bit, the hole saw is first inclined at 45° during operation, slow down the speed of the electric drill, and slowly touch the glass. 3. A crescent is opened on one side of the hole, and the crescent plays a fixed role, and then vertical electric drill start to work, swing makes cutting faster. 4. Don't go too fast in the drilling process, you need to keep adding water to cool the hole saw. Note: Clean water is needed to cool the drill hole while drilling. Good cooling can significantly extend the service life of the hole saw. Do Not working without cooling, Otherwise it is easy to damage the hole saw. Do not drill the toughened glass. The product will look slightly different.