IVY Classic 10965 Chrome Steel Ball Bearings, 1/2-Inch OD x 1/4-Inch ID x 3/16-Inch Thickness, 1/Pouch Shielded ball bearings prevent burning and marring. Manufactured with high temperature lubricant for reliable performance up to 30,000 RPMs Dimensions: Outside Diameter (A): 1/2-inch, Inside Diameter (B): 1/4-inch, Thickness (C): 3/16-inch Sturdy Reusable Pouch