Wood Corner Quick Jig Template Radius R15 R20 R25 R30 for Router Trimmer Carpenter Tool Aluminum Alloy OOTDTY Features:Material: 6061 Aluminum+Brass. Laser engraving R15, R20, R25, R30 table router. Use on a router table or portably. Professional, easy to use. Select the corner of the template you want to duplicate and place it on the desired corner of the wood. Cut out perfect outer rays with these! Size: R15,R20,R25,R30. R15=15mm Radius=0.5906≈9/16, R20=0.7874≈3/4, R25=0.9843≈1", R30=1.1811≈1-3/16"Surface Treatment: Anodic Oxidation (Without Paint) Specifications:Material: 6061 Aluminum+Brass Size: 98*98*46mm Surface Treatment: Anodic Oxidation (Without Paint) Package Included:1 x R15 R20 R25 R30 Woodworking Horn Quick Jig Template Tool -Q&A: Q: Can it be used on wooden boards, or are there any other limitations? A: Suitable for all kinds of boards, do not use on too thin boards Q: what does R mean? How to calculate? A: R stands for radius, such as R25, is a circular arc with a radius of 25mm