DEWALT DT4957 Kit of 29 HSS Cobalt Drill Bits in Plastic Box, Diameters 1 to 13 mm, Long Life with 5% Cobalt, Compatible Cordless and Drills

COBALT HSS 29 PIECE BIT SET: Includes HSS-CO Extreme Cobalt Drill Bits with Helix and Optimized Geometry EXTENDED LIFE - Cobalt content of 8% gives 4 times longer life than standard HHS-R bits DEWALT SPEED: Optimized propeller and tip geometry provides 2x faster speed and reduces overheating STRENGTH: Reinforced center core offers double breaking strength than conventional HSS-R bits EASY CENTERING: Special centering tip facilitates drilling on various surfaces, Weight: 0.719 Pounds, Manufacturer: AmazonUk/3K3AF