ToolUSA 2.5" Diameter Replacement Swivel Casters/Wheels With Single Brake - 4 Pieces: KIT-TSC250SB 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 durability 360 degree swivel makes moving any item easy and simple! - locking mechanism keeps item in place Easy installation with four openings for screws