Excel ES-Casters (4 x 1) Casters Kit for Excel NSF Wire Shelving (Set of 4), 4" x 1", Black 4 casters that fit all Excel NSF wire shelving 4 swivel / 2 with brakes Maximum weight capacity on 4 casters (Evenly distributed): 600 LBS 4 casters that fit all Excel NSF wire shelving 4 swivel/2 with brakes Maximum weight capacity on 4 casters (Evenly distributed): 600 LBS