A set of four casters (two locking, two non-locking) that mount directly to the bottom of a ProLine frame, 100 mm Solid Base. (Do not use on plinth bases.) Casters elevate the enclosure 110 mm when installed. Caster frames are plated steel with ball-bearing pivots. Caster wheels are made of a black polyamide material. Kit includes M12 mounting hardware. A set of four casters supports a maximum load of 450 kg.