ABS universal caster with stable ball bearing is suitable for home use; it can be installed under trash can and different types of storage boxes. With high load capacity, high durability and quiet operation, it is convenient and safe to use. Features: Universal wheel with bearing with steel or rubber balls optional, the kit contains 4 universal wheels for common use. ABS plastic roller frame to support rolling, wear-resistant, burr-free, with high durability and reliable quality . Firm and stable ball bearing, with 360 degree flexible rotation, smooth and quiet operation. No drilling required, easy to install with equipped self-adhesive tape, wait about 24 hours after fixing before use. With high load capacity, the universal wheels can be widely used under trash can, flower rack and different types of storage boxes at home.< br/> Note: The size and color may be slightly different due to manual measurement and different lighting conditions. Thank you for your understanding. Features: Ball bearing: steel/rubber (optional) Main material: ABS Quantity: 4 PCS Item size: approx. 4.5 * 2.8 * 1.4cm / 1.77 * 1.10 * 0.55inch Package Size: Approx. 17*8*1.5cm/6.69*3.15*0.59in Package Weight: Approx. 65g / 2.29 oz Package list: 4 * universal wheel