The Daystar D-Ring Isolators install on any standard 3/4 in. shackle. They simply snap into place and can be installed or removed in moments. Polyurethane acts as an isolator for the shackle and prevents the shackle from tapping against a bumper or any other recovery point when the vehicle is in motion. The Isolator also protects your bumper's finish from scratches caused by D-Ring contact. Daystar D-Ring Isolators are available in Red, Blue, Yellow, or Black and can help add some color to any off-road vehicle. The D-Ring Isolators are sold in pairs.