Spring Loaded Castors – Set of 4 to suitable for Safety Ladders FPW & FPL from 0.6 to 1.8 (CA):

Default position of the castors is down to allow the platform to be moved easily. The castors retract under the weight of the user. Spring Loaded Castors reduce wear on floors and extend castor, wheel and bearing life which means your ladder will last longer. Spring Loaded Castors are practical if you need to frequently reposition your ladder around a factory floor or large flat areas.