Shopping Heavy Duty Jobber Drills 7 Alfa USA Jobber Drill, M7 HSS, 135° S/P, Black O SKU: S160107 7 Alfa USA Jobber Drill, M7 HSS, 135° S/P, Black Oxide, Enveloped Price: $ 1.81 Specifications: Metal Bond Core Drill Bits are used for drilling through glass, tile, ceramic, porcelain, porcelain tile, granite, limestone, slate, & stone. MUST USE WATER FOR LUBRICATION. The spear point type carbide tips no longer work on the new type of hard floor tile. Diamond drill bits when used properly will do the job. Glass Drilling: Approx. 1200-1500 holes. Ceramic Tile: Approx. 500 holes. (Plated also available, but offers a significantly lower number of holes)

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