【Size】11pcs in total:10pcs;6/6/8/20/25/28/35/45/50/65mm diamond drill bits+1pc35mm diamond chamfer bits 【Application】Dry drilling/milling/grinding 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 2000-5000RPM, Widely used in Hand Drill/Bench Drill 【Storage】Portable suitcase included. for easy carry and storage and protect of the diamond tools