These are ball casters that can rotate 360 degrees, suitable for use in processing machinery, furniture, machinery, toys, and so on. Smooth-moving these ball bearing rollers can be used for long time. Small size, light weight, these ball bearing rollers are easy to use, time and efforts saving. Features - Color: Silver. - Material: Carbon steel. - Size: About 3.30X1.20X1.20cm/1.30X0.47X0.47in - Made from sturdy material, these ball bearing rollers move quietly and safely, support long time using. - 360 degree rotation, flexible rotation, metal ball rollers can bring you much convenience to use. - Excellent bearing capacity, rotation ball casters are not easy to deform or break, very stable. - Practical metal casters can be use for workbench, and other small device, threaded design, can be installed firmly. - Small size, light weight, the rotation ball casters are easy to use, take, bring you satisfying using feeling. Package list: 4 x wheels