Technical data Manufacturer: Rubi Manufacturer code: 06978 Diameter: 68mm Recommended speed: 12-14000 rpm Lifespan: about 150 holes Mounting: M14 thread Intended use: wall tiles, floor tiles, natural stone, granite Premium drygres drill 68 mm M14 The Rubi 06978 drill bit is designed for dry use. It is ideal for drilling holes in very hard tiles. RUBI has used VACUUM BRAZED technology in the production of its DRYGRES PREMIUM drill bits. Thanks to this technology, the drill bits withstand the higher temperatures generated during use, which positively affects the drill bit's lifespan. The RUBI 06978 can be mounted on any angle grinder with a standard M14 thread. The drill bit's lifespan depends on its diameter. Smaller drill bits, i.e., those with a diameter of 6 to 12 mm, have a lifespan of 60 holes, while drill bits with a diameter of 20 to 85 mm have a lifespan of approximately 150 holes. ** Illustrative photos