These let you roll your Celestron telescopes that use the Celestron Super-Heavy-Duty tripods. Unlike the ScopeRoller product for the Losmandy mounts, these don't slide into the tripod leg. Instead, the tripod leg slides into the ScopeRoller, and three bolts lock the ScopeRoller into position on the tripod leg. The inner tripod legs for the Celestron Super-Heavy-Duty are 2.39" diameter.
These is only available in the Deluxe and Deluxe5 versions. The Deluxe version adds about 5" to the height of your mount; the Deluxe5 version adds about 7".