Model 100 Rigid Casters are moved primarily with mechanically powered equipment because of the heavy loads they can carry and handle. The legs on rigid caster model 100 have a gusset welded to the center of the legs for added durability. Rigid frames are zinc plated for rust resistance, and there is a grease fitting for the wheel bearings. Model 100 Rigids are offered with both 3โ wide wheels with 1โ diameter axle and 4โ wide wheels with a 1 1/4โ axle diameter. Rigid Plate Casters are normally attached to machinery at the opposite end of the push handle or tow bar. Rigid casters assist in controlling the direction equipment is moved. If machinery must be positioned within a confined space, we recommend using all swivel casters to move the equipment because rigid casters cannot move sideways.