Casters only for 7038 Heavy Duty Set 4 (2 Lock 2 NonLock) Grab Bars Accessories Resolution: 1mmHg Aluminum band assists in Resolution: 1mmHg 5 inch 520 x 1 556 x 520 mm 13 Replacement Caster 5 x 1 1 4 *HD Casters Have Threaded Stem For Extra Security And Safety *All Single Wheel Castes Come With Removable Bolt And Locknut Allowing Disassemlby For Easy Cleaning And Removal Of Build Up Grime Thread Or Anything Else That Your Wheel Picks Up During Normal Usage *This Caster System Will Add Longevity To Your Casters *Swivel: Double Ball Bearing With Hardened Raceways For Extra Strength *Cover: Helps Protect Swivel Bearings *Construction: Heavy Guage Cold Rolled Steel Formed For Strength