4 Qty. Halco 20W R12 SC Bayonet 13V CoverShield 1383/CS 20Aw 13v Miniature Aircraft, Reading Lamp Bulb 20 Watts - 13 Volts Bulb Base : SC Bayonet (BA15s) Bulb Shape : R12 Average Life (Hours) : 300 Length (In.) : 2.6 - Diameter (In.) : 1.5