Slide-Co 1890 Screen Retainer Clips: Fits 3/8" and 7/16" (Black Vinyl),(Pack of 4) Black and plastic Window Screen Retainer Clip For Tub Enclosure Doors Fits 1/2" Thick Door Rails Snap In Tabs Hold Guide To Track Black and plastic For Tub Enclosure Doors Fits 1/2" Thick Door Rails Snap In Tabs Hold Guide To Track Black vinyl construction Used to hold your 3/8 and 7/16 in, screen frame to your window channel 1 in. length Easy to install