Drill bit, straight shank, award winning performance. Probably the best performing, rotary percussion drill bit in the market today. Chrome-nickel-molybdenum steel, same as used in rotary hammer bits. Tungsten carbide tips. Unique carbide tip angle, for highest drilling speeds and durability. Copper-silver brazing joints, for ultimate caribde tip embedment. Straight spiral flute entrance, for a speedy dust removal to ensure fast drilling speeds. Industrial finish. Drill bit diameters meet ANSI standards.