Madico Brown Caster Cups - 3" in (76 mm) Anti-Skid Rubber Base Pack of 2 Caster Cups Item #31822 Madico Brown Caster Cups - Anti-Skid Rubber Base Pack of 2 Caster Cups 029549318223 MC-31822 3" in (76 mm) Base Dimensions 3-3/8" (86 mm)