Fitting for use on stairs, for multi-purpose ladder, professional and industrial model. Supplied = assembled. Product type = accessories for ladders. With this three-part multi-purpose ladder the upper part of the ladder is turned and clamped to the end of the middle part of the ladder thereby providing you with a step ladder for use on stairs. However, make certain there is an overlap of at least 2 rungs between the connection and the front ladder part. Easy assembly, mounting material included.