... The stainless steel spring which allows step to be folded when not in use.3,Made out of ... in black or grey color.5, Static load cap. : 500-1000Ibs6, Can be used as a car step ... Primary competitive advantages:1,ISO9001 quality control and In house or third parties inspection;2,customers designs ... and logos are welcome;3,new products, in a variety of designs; 4,competitive prices;5, ...