We've made it easier than ever to replace your current CST500's dull blade and sleeve with our RIP-CST500-BIT-KIT. This kit includes Ripley's CB 115K (31320) and 29105, when the sleeve's groove on your current tool provide the warning and your blade is noticeably dulling, use the RIP-CST500-BIT-KIT combo kit for an all-in-one solution.