Flex Shaft assembly for the TFL Arrow Rigger. NOTE: We have learned that there are 2 versions of cables available for the Arrow. Please double check your parts manual to make sure this 511b21-a part number is the same as in your manual. Requires: 4mm Drive Dog.Specs Pro shaft: 65mm long x 4mm diameter. Total length: 355mm from end to end.Flex diameter: 1/8" (3.17mm)