Artu 01540 Multi Purpose 6 Piece 1/8 To 3/8 Inch Cobalt And Tungsten Carbide Tip Quick Connect Drill Bit Set

Model 01540 Pack Of 6 Multi Purpose Cobalt And Tungsten Carbide Tip Drill Bits With Quick Connect Shank For Faster Bit Changes. Sizes Are: 1/8, 5/32, 3/16, 1/4, 5/16, and 3/8 Inch Bits. Conveniently Stored In A Hard Clear View Plastic Flip Open Case. 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.