Made from sturdy materials, these ball casters are thick and sturdy, with a practical yet simple design that withstand long term using. These ball bearing rollers are commonly used for workbench, and more items, meet your requirement very well. Features - Color: Silver. - Material: Carbon steel. - Size: About 3.30X1.20X1.20cm/1.30X0.47X0.47in -Constructed from sturdy materials, these ball bearing rollers provide quiet and safe movement and can withstand long-term use. -With their 360-degree rotation and flexible movement, these metal ball rollers offer great convenience in use. -These rotation ball casters have a good bearing capacity and are highly stable, making them resistant to deformation or breakage. -Practical metal casters are suitable for use with workbenches and other small devices, and their threaded design has a secure installation. -The rotation ball casters are small and lightweight, easy to use and transport, and providing a satisfying user experience. Package list: 4 x wheels