Specifications: Foot ring - 16 inches (40 cm) in diameter. Centre hub hole - 2.1 inches (5.3 cm) in diameter. Overall dimensions: 16 inches L x 16 inches W x 2 inches H. Warm Tip: Please measure the gas lift cylinder diameter before purchasing the metal chrome footrest to ensure proper fit for your chair or stool. Stainless steel foot ring resists scratches. Plastic ring inside the metal center hole helps protect your gas lift cylinder from scratches. Black painted metal center spokes provide added stability and sturdiness. Universal size fits standard 2-inch diameter gas lift cylinders. Provides comfortable foot support when sitting on a stool or chair. Adjustable: The footrest can be adjusted to a comfortable height on the gas lift cylinder. Once the desired height is set, secure the footrest in place with the locking screw to ensure stability.