Seville Classics SHE18308WH Commercial NSF Stainless Steel Top Worktable Casters, 4" Diameter, Set of 4 ONLY for Seville Classics Commercial NSF Stainless Steel Top Worktable (SKU: SHE18308B) NOT compatible with Seville Classics steel wire shelving, worktable or other carts Set of 4" locking swivel casters with unthreaded stems (1" long, .33" diameter) Polyurethane wheels with stainless-steel hardware Certified by the NSF to NSF/ANSI Standard 2 - Food Equipment for use in dry environments