Irwin 73320 5/16 inch Turbomax High Speed Steel Drill Bit
• Revolutionary tip design stays sharp longer, up to 28% faster than other leading drill bits
• Three-flatted shank design provides better chuck grip and reduces slippage.
• Bit is constructed of M-1 high speed steel for the best combination of strength, heat resistance
733 series. Fractional straight shank, self centering tip for clean fast starts, Jet Point for clean entry and faster drilling - stays sharp longer, high speed steel features a black body and gold flute, three flatted shank on 3/16" and above for better chuck grip. Drills more holes and drills faster than other leading drill bits. 135° split point.