Apex Tool 1-320993 6" Casters Set of 4

Heavy-duty wheels never puncture or go flat. All purpose rubber tread for grip on many surfaces. 3” x 3” hole patterns. 1-320993 and 1-321990: 6 in; load rating: 3600 lb. 1-320990: 4 in; load rating: 2800 lb. 1-320990 and 1-320993: Set of 4 casters comes with two fixed and two swivel casters. 1-321990: Set of 4 fixed casters