Easy to use and efficient and effortless, this caster is easy to use, simply attach the caster to the bottom of the box and the heavy box moves easily, completely silent and unrestricted when in use. With its 360 degree freedom of rotation and spherical surface pulley, this universal wheel can slide very smoothly at any angle. The high quality material used makes it robust and wear-resistant, with a long service life and good load-bearing capacity. Made of high quality stainless steel and PP materials, it is durable. The length of the product is 4cm, the width is 4.3cm. This caster wheel is suitable for bookshelves, shoes box, toy bins, trash bin, storage box, small container for smooth & easier moving. Item Name: Caster Wheels Material: Stainless Steel,PP Feature: Unrestricted, 360-Degree Rotation, Self Adhesive Size Details: Size: 4cm x 4.3cm/1.57" x 1.69" (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: 4 x Caster Wheels(Others Not Included)