[Load Capacity]: 28 lbs per wheel. 110 lbs total with 4 wheels, 220 lbs total with 8 wheels. Wheel Size: Overall Height 21mm, Mounting Plate Diameter 45mm (1-3/4inch) Tips: 1. These casters only work on smooth and hard surfaces and may leave marks on wooden surfaces. 2. We recommend that you use screws to install the casters for heavy objects. Low profile and 360 degree swivel, low profile casters don't add much height to furniture but can support a lot of weight. The larger steel balls in the ABS bracket roll more smoothly than other small balls. Installation is quick and easy, use the included adhesive pads or screws to mount the swivel wheels to the feet/legs of coffee tables, shelves, cabinets, dressers, plant stands, and more. Make moving furniture quick and easy. Not only for furniture but also for storage containers, under bed storage drawers, tool boxes, air purifiers, stand/tower fans... Colour:black Material:ABS+metal Package Contents: 8 x Self Adhesive Caster Wheels 32 x screws Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.