For RIC. GR IV, GR IV HDF, and GR IV Monochrome cameras;Injection-molded bayonet-style mount ensures a precise fit and protects the camera’s lens mount;Blocks stray light to reduce lens flare, with no vignetting after installation;Extends the lens front to provide additional protection against accidental impacts;Made of premium aluminum alloy for long-lasting durability;Compatible with JJC LC-GR4 lens cap and JJC F-WMCUVG3 filter