Yes and they are very expensive in the UK. Fox firearms and the Optics warehouse stock them. They are readily available in places like Walmart in US hence I brought 3 sets back with me last summer. Its a pity you posted now as my son has just come back from a month in USA. Much better choice in US about $45 a set in UK more like £60 however saying this they are the best adjustable rings on the market, inserts are very good for resolving misaligned bases. Also remember if your mounting on a rail you may well need 1 or two sizes lower than you think you do to allow for the rail height.