Some horses may require a higher head-set to start the race, but then perform better at a lower setting as the race gets underway and the horse achieves its stride. The use of an Automatic Headcheck is perfect in these instances, as it allows the driver to adjust the headcheck whilst in motion. The stainless steel pulley is screwed into the saddle (in place of the McKinney Hook), and the headcheck front is attached to the dee on the end of the chain. The straps are attached to the vehicle via clips. The grey strap is used to shorten the headcheck and achieve a higher head-set. The red strap is used to release the chain and lengthen the headcheck. Replacement Straps are also available for separate purchase.