[Features] ●For reverse nesting rack. ●Prevents front legs from opening. ●Prevents distortion due to load and reinforces reverseness. - Developed as an earthquake resistant item. ●It can be installed easily without the need for tools. ●Can be stored together with the rack. ●The upper pin type can also be used for the 2nd stage, but the lower pin type has a different size for the 2nd stage.