4" tall Casters for 19" OPEN RACKS w/4 posts Quantity in Basket:noneCode: Rack-Caster Price:$51.00Shipping Weight: 10.00 pounds Quantity: 4 caters in a set 440 LBS capacity for each caster Lockable front casters Wheel dimensions: 2.75" diameter, 1.75" wide M12 thread and 0.75" long Ball bearing Overall 4" high