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 4's. See Bit Extensions if more length is required. P. O. P packaged