These marker lights are a welcome addition to any skull enthusiast. The lights are CNC machined from billet aluminum and have a red LED display. Lights measure approx. 2 1/2" by 2 1/2" (6.3 cmx6.3 cm) and can be installed on any flat surface such as saddle bags, tour packs or fender surfaces. The marker lights feature a threaded back with a panel mounting nut, which require a 2 1/8" (5.4 cm) hole for mounting. Sold in pairs.