The double ended wooden roller has concave for polyester / fiberglass screens and convexs for metal screens, offering proper pressure application for different screen materials Ideal for various screen replacement projects including window, doors, patios enclosures, making it versatile for most Americans household needs Sharpens removal hook efficiently extracts old spline from window frames, while the ergonomic roller simplifies new screen installation with precise pressures control This 5pcs window screen repair set includes all essential tool for easy installation and replacement, featuring a screen roller, spline, clips, and removal hook for complete solution Durability rubber spline and elastic clips provide strong grip and tear resistance, ensuring secure screen attachment while allowing easy removal when needed, Manufacturer: XIBEIDIANZI