Professional 24 piece 135 degree split point drill bit set. The sizes range from 116 to 12 inch.Nitro 24 Piece High-Speed Steel Heavy-Duty Jobber Drill Bit Set, Black and Gold Oxide Finish, Round Shank, Spiral Flute, 135 Degrees Split Point.The Nitro Heavy Duty 135 Split Point drill with Nitride surface treatment, manufactured from a premium grade of M-7N molybdenum high speed steel. the Nitro ...