Spring, Helical Compression, .245 O.D. x .26 Fits Century II control block013-025-00Pkg-1 eaReplaces 24V Volt/150 Watt bulbs in older 6300 lightsA-dec and Century are a registered trademark of A-dec, Inc.DCI has no affiliation with A-dec and A-dec has not authorized DCI replacement parts to be used on or in connection with A-dec products.