【Size】3pcs in total: 3pcs;20mm Diamond Drill Bits;35mm Diamond Chamfer Bit;20mm Diamond Finger Bits 【Application】Dry drilling for porcelain tile, granite, marble, stone, Masonry, brick... Wet drilling can prolong the service life 【Technology】This tiling installation kit is made of high quality diamond and steel by vacuum brazed diamond technology.provide very high efficiency, drilling and milling faster, durable and sturdy 【Features】Fast and smooth drilling, long lifetime, less chipping.Recommended RPM is 6000; Maximum RPM is 11000, Widely used in Angle Grinder,If you want used on hand drill,bench drill,you can use the adapter on the pack. 【Storage】Portable bag included. for easy carry and storage and protect of the diamond tools