This item is a screen rolling tool with wood handle used primarily for installing fiberglass screen fabric into window screens and screen doors. Designed for standard-duty usage. It is a combination tool with a 1-5/16 x 3/32 in convex steel roller at one end and a 1-5/16 x 3/32 in concave steel roller at the other. To be used with vinyl screen spline sizes 0.115 up to 0.165 in.