The Slider Spa Cover Roller is not a cover lift, but a simple and economical spa cover remover and storage device with a roll-away design. No complicated assembly is required because it mounts with just a screwdriver. The dual arms are made from rust-free polycarbonate composite which is reinforced with fiberglass for added strength. Simply fold your hot tub's cover over, and roll it off. The Roller folds neatly down, when cover is on your spa. Extends 32" when deployed. Stainless mounting screws included. Minimum spa cabinet height 32" for arms to fold flat while Slider Cover Roller is not in use.(Spa cover is not included.). Suitable for spa covers under 75 pounds. Not for heavy or waterlogged covers.