Caster; Swivel; 8 x 2-1/2; V-Groove (7/8) Cast Iron; Top Plate (5-1/4x7-1/4; holes: 3-3/8x5-1/4 slotted to 4-1/8x6-1/8; 1/2 bolt); Zinc; Roller Brng; 3500# (Item #66604)