Description:It is ball type design that make this case roller is practical and can rotate 360 degrees at will without limitation of sliding.With strong bearing capacity and self-adhesion design, it is durable in use and convenient for you to install.This case wheel is made of high quality plastic and metal material, which is strong and long-lasting.The length of this wheel is 4.6cm.It is suitable for most of storage case.Item Name: Box CasterMaterial: Plastic,MetalFeatures: 360 Degree Rotatable, Easy Installation, PortableColor: WhiteSize Details: Length: 4.6cm/1.81" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 Set of Box Caster(Total 4Pcs)