The Fakro LSS 31 is an extra step designed for Fakro LST scissor ladders only. It is compatible with the following models: LST 22 x 31, LST 22 x 47, LST 25 x 47, LST 22 x 54, and LST 25 x 54. This additional step extends the ladder's ceiling height range and includes all necessary hardware for proper installation. It also features an anti-slip surface and a modern design for added safety and convenience.