Set of ladder castors to retrofit, for cross beams, pack of 2. Supplied = assembled. Ergonomic and convenient ladder transport. Reduces the strain on joints and the back. User-friendly operation. Simply roll it instead of dragging it: the ladder castor retrofit set for cross beams makes it easy to move rung ladders from place to place without hurting your back. The amount of force required to roll the ladder is reduced to half of the original required to carry the weight. The secure and self-locking folding mechanism allows the castors to be conveniently placed in the required position using your foot, without bending over. This provides additional ergonomics and comfort. They can be subsequently fitted to rung and step ladders with a cross beam made by GNZBURGER STEIGTECHNIK easily, quickly and without drill holes.