The radius fillet gauge set contains 5 different shapes and measuring ranges: R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25/ R25-50 to meet your various needs. This radius gauge is made of high quality stainless steel. , Durable, high hardness, anti-rust. Radius gauges have two types of blades so that convex and concave surfaces can be checked. The convex pattern is used to detect the curvature of the concave surface, and the concave template is used to detect the curvature of the convex surface. 360-degree locking screw design allows you to unfold or fold easily. Each leaf is clearly marked for easy identification of which leaf you need. This radius gauge is widely used in home improvement, machine installation, and electrical equipment. It is suitable for many workers such as tool mold manufacturers and mechanics to check the radius of tools, and measure the thickness or width of screws, valves, and bearings. DIY Supplies: Electrical Products: Ruler Woodworking Model: Radius Gauge Color: Silver Material: Stainless Steel Package Contents: 1* R0.3-1.5 Radius Gauge 1* R1-6.5 Radius Gauge 1* R7-14.5 Radius Gauge 1* R15-25 Radius Gauge 1* R25-50 Radius Gauge Only the above package content, other products are not included. Note: Lighting and different monitors may cause the item color in the picture to be slightly different from the real one. The measurement allowable error is +/-1-3cm.