4 in. Rubber Swivel Caster with Brake

Elastic Blue soft rubber swivel caster with brake for general use. Instantly returns to original shape after relieved of load. Smooth rolling mechanism for easy movement on a variety of surfaces (carpet, ceramic, wood, and concrete) and for passing over small obstacles. Abrasion-resistant and does not mark surfaces. Assembly with 3 1/8 in. x 4 in. screw-on plate, blue.