This wheel caster has a 1/2" x 7/8" (Dia x L) threaded swivel stem. The durable zinc device is best used with 5" x 1 ¼" (Dia x W) solid tires. This wheel caster attaches to the tire and allows full rotation through a 5/16" axle bore. The cart attachment can support a max load of up to 350 pounds. This wheel caster exceeds all shopping cart standards.