OP/TECH USA 1101551 55MM Fastcap- Metal Ring, Flip-Open Lens Cap for Cameras

Once attached to a lens or filter, base stays in place when hinged, spring-loaded lid is flipped open by a flick of the thumbCover can be adjusted for the most convenient position of the opening tabYou'll quickly consider the FAST CAP an integral part of your camera, and an essential component of your picture taking routine!Easy to attach - new metal ring threads onto lens or filter.Protects lenses from dust, moisture and impact.Incorporates water and dust-tight O-ring seal.Spring-loaded lid

Source: Digital Camera and Video Store...