Standard-Duty 5" Swivel Stem Caster Gray Polyurethane Tread With Polyolefin Hub, Castr Type: Swivel, Load Cap: 640Lbper Set Of 4, Load Heght: 5 5/8", Material: Polyolefingray Hub, Material: Polyurethanegray Tread, Mountstud: 7/16"Odx 1 3/8" Stem, Mounttype: Stem, Note: Includes Retaining Ring, Product Type: Standard-Duty, Weight: 1.215Lb, Wheel Diam: 5", Wheel Wdth: 1 1/4",