Diamond Granite Ceramic Drilling Extractor Review

MATERIAL: These diamond drill bits made of high-speed steel that is durable and have a long sevice life, red paints on the body of this bit to avoid getting rusty. 11 DIFFERENT SIZES meets your different requirement: 6mm(6/25"), 8mm (8/25"), 10mm(2/5"), 12mm(12/25"), 16mm(16/25"), 20mm(4/5"), 22mm(7/8"), 25mm(1"), 30mm(1 1/5" ), 38mmmm(1 1/2"), 50mm(2"), Can be used with a standard electric drill. SUPERIOR PERFORMANCE: Small incision resistance,feature drilling stably, fast speed, not breaking the border. Opening neat, smooth, no broken edges, no tremor phenomenon, chip easily. WIDE APPLICATION : Drilling in glass, tiles, marble, granite, wood and other flat surfaces and making clean and accurate hole on glass and tile. This diamond drill bits set is a great gift for any DIY lover. SPEED KILLS: Reduced drill speeds, low drill pressure and increased use of water lubrication will extend drill bit life considerably.