【SIZE】diameter 2-1/2 Inch(65mm), 5/8"-11 Thread, diamond height 10mm, total height 60mm, diamond grit #35/40; 1pc triangle shank adapter. 【APPLICATION】Dry or wet drilling for porcelain tile, granite, marble, stone, masonry, brick... Wet drilling can prolong the service life. 【TECHNOLOGY】Made of high quality diamond and steel by vacuum brazed diamond technology, provide very high efficiency, drilling faster, durable and sturdy. 【FEATURES】Fast and smooth drilling, long lifetime, less chipping. Lightening Shape Design to fast remove chips, improve drilling efficiency and wear resistance of hole drill. 【MACHINE】Recommended RPM is 6000; Maximum RPM is 11000. Widely used in Angle Grinder. If you want to use electric drill or other machine, you can use Triangle Shank Adapter. Triangle Shank drill bits suitable for any Hand Drill, Cordless Drill, Bench Drill. Recommended RPM: 2000-5000RPM. The faster the speed, the longer the service life.