Cheek adaptor for 50mm blocks. Can be used with:A2150 - 50mm Pro-RatchetA2050 - 50mm Dynamic Single BlockSimply 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.