Bit SizePin ConnectionIADC 522IADC 5272 7/8”N RodX2 15/16”N RodX3”N RodX3 1/4”N RodX3 1/2”N Rod or 2 3/8” API Reg.X3 3/4”2 3/8” API RegX3 7/8”2 3/8” API RegXX4”2 3/8” API RegX4 1/8”2 3/8” API RegX4 1/4”2 3/8” API RegX4 1/2”2 3/8” API RegX4 3/4”2 7/8” API RegXX4 7/8”2 7/8” API RegXX5”2 7/8” API RegX5 1/8”2 7/8” API RegXX5 1/4”2 7/8” API RegXX5 5/8”3 1/2” API RegX5 3/4”3 1/2” API RegX5 7/8”3 1/2” API RegX6”3 1/2” API RegXX6 1/4”3 1/2” API RegX6 1/2”3 1/2” API RegX6 3/4”3 1/2” API RegX