This Mini TCR blade and drygres drill kit by Rubi includes 2 x 6mm, 20mm, 28mm drills, adapter and a TCR blade with handy carry case. The diamond drill bits are used for dry drilling materials such as porcelain, ceramic, glazed tiles, natural stone and other materials. Suitable to use with angle grinders and electrical drills without hammer. They are designed with vaccum brazed technology to prolong the life of the diamond drill bit and have a maximum work speed of 14000rpm. Also included in this kit is the Rubi TCR continuous diamond rim blade used with an angle grinder for cutting porcelain tiles.