Purchased 3 years ago. 6kg, approximately 28mm in diameter, 5.4kg actual weight. I can't access the website where I bought it, so I measured the size myself. It was listed as 6kg when purchased, but it measured 5.4kg. I measured the diameter as 28mm, but there may be some error. For those using it as a single item: Please consider purchasing. The metal part has a rough iron surface, so I've wrapped it with vinyl tape for safety. I will re-wrap it before shipping.