Improved cutting edge provides 30% longer life span Patented new design for improved cutting and cleaner holes Self-feeding screw point draws bit through wood Unique patented design cutting angle - smoother starts, reduced cutting loads Made of super tough, heat-treated steel Cuts through nails and provides longer life Shorty bits - for working in tight places, yet still can go through three abutting 2 x 4s See Bit Extensions if more length is required P.O.P packaged