Features: * Cobalt no.4 size: 3/16-inch to 7/8-inch steps in 1/16-inch increments * 6 times longer life than the competition * M35 grade Cobalt HSS * Radial concave flute * 3-flatted shank * Speedpoint tip What"s In the Box: * Irwin 10234CB Cobalt Unibit No.4 Step Drill Bit