set of 7 adapter rings for mounting filters which have a diameter greater than those of goals. Very convenient and economical because allows only buy one filter (polarizing, for example) and mount it on all your goals. For my part, I have a polarizing diam 72, and I can get on the objectives of 62mm diameter and 52mm by combining several of these rings between them. Ditto for windscreen macro 72mm diam. Product conforms to the description, and of good quality. I recommend this product.