These hole caps are made of billet aluminum with a polished bezel. The clear lens protects the 12 volt LED light inside. Select White for backup lights or the red lamp for applications combining the running lamp with turn signal or brake lights. All lighted hole caps come with approximately 10" pigtail wires. These are used for 47-66 original bedsides and 47-87 MAR-K reproduction bedsides only hole size 1-19/32". Sold in pairs.