Used commonly on farms and in machine shops. 135 degree split point eliminates the need for a center punch and keeps from skating on hard materials. Sizes 9/16 to 3/4 have a 3/8 reduced shank with 3 flats. Sizes 7/8 to 1 have a 1/2 reduced shank wit h 3 flats.. Vulcan 3/8 Redc Shnk Drill Bit 5/8 270491OR MIBRO GROUP (THE)