ToolUSA 2.5" Diameter Rubber Replacement Wheels/Caster - 4 Pieces: KIT-TSC250F 2 1/2 Inch Diameter Wheel With A 3 3/8 Inch Overall Height 7/8 inch wheel thickness with two rows of ball bearings in hardened raceways Zinc plated finsh with a formed steel plate that is double welded for durablitiy Fixed caster is a great addition to many household items to move them seamlessly Easy installation with four openings for screws