TK12SPK, Single mounting kit for one General Electric THKM12/TKM31200 or smaller circuit breakers. Every company has a nick name for these kits. Strap kits, connector kits, bus kits, mounting hardware kits. Most people need help, so please call for assistance. We can avoid returns and you don't want to get the wrong item or the job stops. We can really help. Please take a good phone/camera picture and email us at sales@breakeroutlet.com, then call 800-321-8998, you'll be happier.