80mm 3" castor blue rubber swivel & fixed strong 560kg capacity, set of 4

Set of 4 - 80mm blue elastic rubber castors with top plate.These 2 swivel & 2 fixed castors has blue solid elastic rubber wheels with nylon centres, plain bearing.Item dimensions as follows:Wheel diameter: 80mmWheel tread width: 32mmWheel bearing: Plain bearingTop plate size swivel castor: 100x80mmTop plate size fixed castor: 100x84mmMounting hole centres: 80x60mmMounting hole size: 9mmOverall height: 111mmLoad capacity: 140kg per castor (560kg per set)Hardness of wheel tread 70° Shore A.Low rolling resistance, low operating noise and very good floor preservation. Non-marking.The high elasticity of the rubber makes the wheel resume to its round shape faster, avoiding flat spots, and therefore gives a lower rolling resistance than for standard grade rubber.Good chemical resistance, except to oils.