The Greenlee 660QA Quick-Adjust Cable Tray Sheave is intended for the installation of cables in cable tray. It is intended for non basket-style cable tray Features 7x faster setup and disconnect Attaches to all varied size tray rung spacing No loose pieces Adjustable Slide leg that can be extended to fit on tray rung spaces up to 20" (508 mm) Set Screw Handle to easily lock and unlock adjustable sliding leg Edge hook feet to grab tray more securely Steel frame easily attaches to cable tray up to 2" 950.8 mm) thick Cast aluminum sheave with robust shaft and bronze bushings Easily handle forces of up to 100 lbs (45.4 kg) Designed and Assembled in USA Application: Use to assist pulling cables along non basket-style cable trays. Designed to aid loads during straight runs on the tray.Greenlee