Bosch 21-Piece Assorted Black Oxide Coated HSS Twist Drill Bit SetNo skate tip for clean and accurate starts Black oxide coating generates less friction Three flat shank promotes better grip on bits 3 16 In. and larger Universal drilling applications designed for general purpose use High visibility marking provide clearly marked diameter Features Brand Model Compatibility Fits most drill dirvers Type Jobber length Bit Length Set Shank Size Set Shank Type Flat Right Left Hand Right handed Tip Geometry 135 degree