These black caster wheels are made from durable zinc steel and polyolefin material, with a load capacity of 3960 pounds. The 3" diameter wheels have a 1-1/4" width and can swivel 360 degrees. They provide superior floor protection, operate quietly, and are easy to clean. Perfect for heavy-duty equipment, each pack includes 12 caster wheels with a top plate size of 2-3/8"x3-5/8" and mounting over height of 4-1/8". Upgrade your equipment with these reliable caster wheels.