Rebaydo 2pcs P15d-30 Cap plated metal cap with epoxy bottom construction featuring a 15 mm base diameter, 30 mm ring diameter, and 2 contacts. Designed with solder-able base and contacts for rugged long-life performance in old vintage and classic cars, tractors, and motorcycles. Caution: When installing bulbs into older or corroded sockets, use care during installation and removal. Excessive force or damaged/corroded sockets may cause the metal retaining ring or base to break - NCNRNW. CE and RoHS compliant.