Artu 01464 Multi Purpose 1/4 Inch Cobalt And Tungsten Carbide Quick Connect Drill Bit

Model 01461 Multi Purpose 1/4 Inch Cobalt And Tungsten Carbide Tip Drill Bit With Quick Connect Shank For Faster Bit Changes. Designed For Rotary Or Percussion Drilling. At 1000+ rpm Use On Masonry, Ceramic Tile, Concrete, Brisk, Granite Or Marble. At 300-700rpm Use On Glass. At 500-800rpm Use On Fiberglass Or Plexiglass. At 800-1500rpm Use On Hard Wood. At 1500+ rpm Use On Soft Wood. At 2000+ rpm Use On Cast Metal Or Hardened Steel. To Resharpen Simply Grind The 2 Flat Surfaces. Best If Resharpened With ARTU Silicone Carbide Grinding Wheel #01551.