These innovative Clip-on casters can be clamped onto a Zarges container in seconds, no tools are required. Zarges casters provide mobility for all K470 boxes with dimensions of 21.6 in × 13.7 in upwards. Made of solid rubber, 4 in, casters fitted with wheel brakes. Aluminum Shipping and Storage Case Casters Mobility for K470 aluminum cases with dimensions of 21.6 in × 13.7 in and upwards. Tool-free installation. Made of solid rubber, 4" casters fitted with wheel brakes. Configuration recommendations: Two swivel and two fixed casters; or, for maximum mobility , four swivel casters.