Rigid V-Groove Caster, 6" x 2.5" Heavy Steel V-Groove Wheel with Greasable Bearings, 7-5/8" Overall High. Top Plate: 4-3/4" x 6-1/2" with Slotted Bolt Holes to 3-1/2" x 5-3/8" Centers. Use for Carts on Angle Iron Tracks in Manufacturing or Production Assembly. Surface Rust on Caster Face from lack of use only. Casters in excellent condition.