Features Transform caliber adapter ring it can be installed in front of the lens to achieve different diameter share the same lens diameter filter hood additional lens or other accessories to achieve the purpose of increasing the lens diameter the adapter ring is aluminum alloy black durable small diameter outer thread connection end of the lens a large diameter internal thread take a variety of the same caliber filters UV CPL starlight mirror gray mirror close up lens hood etc lightweight and portable easy to install and can save money others can also improve some of the hidden corners of the problem Ring is a small turn up conversion caliber adapter ring Specification Material AluminumFit For Universal Package Included 1 x 49mm 52mm Step up Ring1 x 52mm 55mm Step up Ring1 x 55mm 58mm Step up Ring1 x 58mm 62mm Step up Ring1 x 62mm 67mm Step up Ring1 x 67mm 72mm Step up Ring1 x 72mm 77mm Step up RingDetail Pitcures