【Size】6pcs in total: 4pcs;4/5"(20mm)/1"(25mm)/1-3/8"(35mm)/2"(50mm) + 1pc 4/5"(20mm) Diamond finger milling Bit + 1pc 2"(50mm) Diamond beveling Chamfer Bit 【Application】Dry drilling/milling for porcelain tile, granite, marble, stone, Masonry, brick... Wet drilling/milling 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 to use electric drill or other machine, you can use SDS or HEX/Triangle Shank Adapter 【Storage】Portable suitcase included. for easy carry and storage and protect of the diamond tools