Bit SizePin ConnectionIADC 111IADC 211IADC 231IADC 321IADC 3392 7/8”N RodXX2 15/16”N RodXXXX3”N RodXX3 1/4”N RodXX3 1/2”N Rod or 2 3/8” API RegXX3 3/4”2 3/8” API RegXX3 7/8”2 3/8” API RegXXXX4”2 3/8” API RegXXX4 1/8”2 3/8” API RegXXX4 1/4”2 3/8” API RegXXX4 1/2”2 3/8” API RegXXXX4 3/4”2 7/8” API RegXXX4 7/8”2 7/8” API RegX5”2 7/8” API RegX5 1/8”2 7/8” API RegXX5 1/4”2 7/8” API RegXXX5 5/8”3 1/2” API RegXX5 3/4”3 1/2” API RegXXX5 7/8”3 1/2” API RegXXXX6”3 1/2” API RegXXXX6 1/4”3 1/2” API RegXXX6 1/2”3 1/2” API RegXXX6 3/4”3 1/2” API RegXX