Contains Sizes: 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16" & 1" Reduced Shank for sizes above 10mm and 3/8 to suit 10mm or 12.5mm drill chucks Black oxide coating maximises lubricant hold, therefore assisting chip flow and heat dissipation 3 flats on shank, prevents slippage in chuck 118° Split Point ideal for drilling into pilot holes