The Kuryakyn 8106 head bolt covers provide the finishing detail to give your motorcycle a customized look. Features a peaked cover design and a chrome finish. Quick and easy installation that dresses up the look of standard head bolts. Includes (4) head bolt covers and (4) #8-32 x 3/16" set screws; suggested for installation (not included): hex wrench set. The Kuryakyn 8106 head bolt covers are compatible with Harley-Davidson models: 87-19 Evolution and Twin Cam engines.