CASTER BK Resources Model No. 5SBR‐RA‐PLY‐PS4 Packed 1 kt Caster Kit, work table POP box, 5″ diameter expanding stem, fits 1‐ 5/8″ OD tubing, non‐marking polyurethane tread, top lock brake, 300 lb. capacity, resistant to acids & caustics, double ball bearing, operational temp range ‐45° to 180° F, zinc plated, NSF (4 per kit)