A roller for large pool covers keeps the blanket aligned, prevents edge abrasion and optimises every open/close cycle on up to 50 m pools. IASO supplies mobile trolleys with braked wheels, rail-guided systems for lane-by-lane deployment and high-capacity fixed units at the pool end; available manual, assisted or motorised to match operations. An highly strong shaft, low-friction bearings and accessories—pulling straps, end-stops, guides and sleeves—accommodate macro-covers, solar blankets or foam covers. The outcome: reduced effort, shorter manoeuvre times and fewer incidents, with maintenance limited to periodic checks of fixings and brakes. Note: not a child-safety system; it ensures professional handling that protects your investment and supports energy efficiency and water quality.