Caster; Rigid; 10 x 3; PolyU on Cast Iron (Gr/Bk); Top Plate (6-1/4x7-1/2: holes: 4-1/8x6 slotted to 4-1/2x6-1/8; 1/2 bolt); Zinc; Roller Brng; 3000# (Item #66595)