1.DIY positioning tool for woodworking cutting machines: With four different angle and radius options (R10/R15/R20/R25)/(R30/R35/R40/R50), this rounded R corner arch template is suitable for many different purposes woodworking DIY projects that meet your different requirements 2.4in1 arc angle positioning template: Simple design and construction make this template easy to use. Even inexperienced carpenters can easily complete DIY projects and thus improve work efficiency and quality 3.Cutting machine can be reused for positioning and accurate measurement: The stencil is marked with clear scales that help you accurately measure and draw the R corner arches to ensure the accuracy and consistency of the project 4.Highquality material: The rounded corner radius template is made of durable aluminium alloy material, which is reusable and does not wear or deform easily, which ensures a long life