OP/TECH USA Fast Cap with Metal Ring - 52mm Never misplace your lens cap again! Spring-loaded lid protects camera lens and flips open with a flick of the thumb Easy to attach; metal ring threads onto lens or filter to become an integral part of camera Lid wraps around rim of lens or filter to protect against dust, moisture and impact and can be adjusted for the most convenient position of the opening tab Incorporates water and dust-tight O-ring seal Made in the USA