This extension spring from Prime-Line is constructed from 0.105 gauge, heat-tempered, spring steel wire plated in a bright nickel finish. It offers superior strength and long lasting tension. This spring features a single loop, closed end design and measures 16 inch in length by 1-1/8 inch in diameter. This type of spring can be used on toys, equipment, tools and for a variety of other household applications. Made from durable0.105 diameter wireMaximum weight capacity is 31.2 poundProvides resistance to compression forcesOpen wound helical finished at ends