Viking Type 280-UB S&D-4SP Silver & Deming 4 piece Drill Set with Black & Gold surface Treatment. Recommended for use in work hardening grades of stainless steel and other tough hard metal drilling applications. Set contains one each of the following sizes: 9/16", 5/8", 3/4", and 1". Drill bits feature a 1/2" reduced shank with 3-Flats on shank to provide a secure grip in standard Jacobs style chucks sized 1/2" and larger. 135° Split point allows for fast penetration and accurate hole starting without a center punch. Bits are of one piece solid construction, manufactured in the USA of special Hi-moly tool steel. Set includes a hi-impact polymer storage case.