Improve Screen Stability: The screen spring clips hold the screen securely in the aluminum channel, preventing it from wobbling if the frame is not sized properly,Fit Size: The screen spring clip is 0.19 inches wide and 2.1 inches long, can be inserted into the gap of 3/8 inch or 7/16 inch thick window screen frame,Flexible and Durable: The window screen tension is made of stainless steel, durable, rust-resistant, not easy to break and deform, providing a secure and long-lasting fixing for the screens,Wide Application:The window screen holder clips can be used for different types and window frames, straight cut, miter cut, extruded window screens, 30pcs tension spring angle clips are enough to meet your needs,Easy to Install: just remove the screen frame and replace the corner clips to the edge of the screen to create tension to hold the screen frame in place