Caster; Swivel; 8 x 3; PolyU on Cast Iron (Gr/Bk); Top Plate (5-1/4x7-1/4; holes: 3-3/8x5-1/4 slotted to 4-1/8x6-1/8; 1/2 bolt); Zinc; Tapered Rlr Brng; 3500#; (Item #66492)