Quad track roller system Quick flip-and-lock mechanism Extra-heavy gauge Diamond Plate foot platforms Extra heavy-duty 2 x 4 Inch 11-gauge steel mainframe Easy-access under-carriage plate load system Ultra-tough, double-stitched DuraFirm Back and Shoulder pads are 4 inch thick and contoured Three lockout positions Weight of the carriage with no weights is 80lbs Ideal for home and commercial use