Cheek adaptor for 60mm blocks.Can be used with:A2160 - 60mm Pro-Ratchet BlockA2160WAVE - 60mm Wave Pro-Ratchet BlockA2060 - 60mm Dynamic Single Block. Simply remove the shackle from the top of your block and insert the block into the cheek adaptor.The adaptor allows for three fixings to be used to ensure a strong and reliable fitting to any surface. The chamfered shape of the cheek adaptor limits the chances of snagging.