The radius fillet gauges set contains 5 different shapes and measuring range: R0.3-1.5/ R1-6.5/ R7-14.5/ R15-25/ R25-50 to meet you need. This radius gauge is made of high quality stainless steel, durable, high hardness and resistant to rust. The radius measuring instrument has two types of leaves so it can check both convex and concave surfaces. The convex pattern is used to detect the concave surface arc, and the concave template is used to detect the convex surface arc. The 360-degree Locking Screw design allows you to unfold or fold it . Each leaf is clearly marked, convenient to identify which leaf you need. This radius gauge is widely used improvement, machine installation, electric equipment, suitable for tool and mold manufacturers, mechanics and many other workers to check the tool radius of the meter, measure the thickness or width of screw, valve, . : Electrical Product: ruler woodworking Model Number: Radius Gauges colour: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: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.