Also called the Roto Thigh Brace Set. Best used as replacements for the underlying thigh braces structure common on late model Wave Sport brand white water kayaks. These have a slot and a pair of brass threaded receivers, M5 metric, as seen in the product photo. The included mounting hardware pack comes with two 14/-20 screws (for the U-Nuts) and two M5 screws for the brass threaded receivers. Instructions are not included. This item is assumed to be related to USA part numbers 9800722 and 8025008.WAVEOUT thighbraces