iron caster solid wheel without brake

Four Size available: 4",5",6",8" 

[General Feature]: 
*Wheel Material: cast iron

* Fixe/Swivel with Plate/Swivel with Plate and Brake 
*Double ball bearing 
*Housing be made of pressed steel 
*6mm thickness for Steel plate 
*Zinc plating or Electrophoresis finish 
*High shock absorption /High abrasion resistance/ High Stain resistance 
*Top quantity Competive price