IRWIN 4935109 Jobber Drill Bit, Spiral Flute, 3-3/4 in L Flute, Straight Shank, 5/16 in Dia x 1 in L Shank

High speed steel with four facet diamond ground carbide tip, for use with corded or cordless drills in multi material applications such as brick, block, ceramic tile, marble, wood, dry wall, gypsum board, limestone, slate, plastics/reinforced plastics, sheet metal, and cast iron. Can also be used in hammer drills.Carbide tip has a unique diamond-ground, four-facet design with sharper cutting edges for centered starts with no walking, fast drilling and excellent hole quality in a variety of materials

Carbide tip has a unique diamond-ground, four-facet design with sharper cutting edges for centered starts with no walking, fast drilling and excellent hole quality in a variety of materials

Double-milled flute ensures fast, efficient removal of drilling dust and debris to increase speed and prevent clogging

Compatible with all standard 1/2 in and 3/8 in chuck drills