Brand:RUBIFeatures:Diamond drill bits 2-1/4 in. to be used with electric drill without hammer.The quality of the diamond allows the drilling of ceramics, porcelain, granite, marble and glass.Ideal to install bathroom accessories and any type of decorative accessories over ceramic surfaces.They must always be used with the EASY GRES guide which allows their adecuate refrigeration ensuring a high accuracy and good results.Average life between 5 and 10 holes depending on the material.Body made of steel and bit made of electrodeposited diamond.Lateral opening to improve cooling of the drill bit and to allow the elimination of solid waste produced after the drilling of the hole.Recommended speed of use between 400 and 1000 r.p.m. depending of the material to be drilled.To achieve a better finish and a longer life of the drill bit, it's important to observe the adequate speed of use and to apply a moderate pressure during the drilling.

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