Provides maximum benefits in vibration transfer, ESD safety, and cost. Vibration transfer is dramatically reduced via polyurethane 50 shore A casters with expander stems, 5˝ (127mm) swivel, two with brake. Carts are ESD-safe via aluminum split sleeves and an optional grounding device (ESD grounding cable or anti-static drag chain available). All models feature front and rear tray locks to ensure product safety. End- and side-load units available. Full and half height units available. Half height models feature push handles. Aluminum split sleeves. ETCE20-Z half size, end load model with optional drag chain and ESD trays