Note: The maker supplied a review sample for evaluation, the opinion of the product is my own personal viewThis set of stepping rings is a "one hit" solution meaning it covers every common filter size from 82mm down to 37mm with all the sizes in between you would expect. There might be a few odd compact camera filter sizes using non standard sizes not here but for SLR or ILC users this will fit every lens filter. The rings are made from anodised aluminium and I looked quite closely at the threading as well as using them on various lenses and filters I didn't have any problems the threads are well defined and clean that's quite important.Looking at the rings the first number on each one tells you the thread size for the lens the second for the filter for example a 67mm-62mm ring means you can put a 62mm filter on a 67mm lens filter size very easy to follow. Whilst it is possible to buy stepping rings that cover bigger gaps in one go (say a 77mm filer to a 55mm) you can get there with this kit just use multiple rings. Covers all you need and can save you a fortune replicating expensive filters in different sizes. A must have