Combination tool with wood handle. Steel convex and concave rollers used to install most screening materials and vinyl spline into window screen frame. Used to install most screening materialsWood handleSteel convex and concave rollersSpline size range: .115 - .165This screen rolling tool is constructed from steel. It features convex and concave rollers with a wooden handle. This tool is used to install most screening materials and vinyl spline into window screen frame.