Key benefits Fast, reliable radius checking for both convex and concave surfaces — removes guesswork when matching or inspecting radii. High repeatability: precision ±0.1 mm minimizes measurement error and speeds up setup and inspection. Durable, corrosion-resistant construction for long service in shop or field environments. What makes it stand out Two clearly marked blade types included so you can quickly identify and use the correct template for convex or concave arcs. Compact, robust alloy-steel construction with a hardened surface for strength, elasticity and rust resistance. Broad measuring range with fine gradation: 17 convex numbers covering radii from 1 to 7 mm. Specifications Convex numbers: 17 Measuring range: 1–7 mm Precision (accuracy): ±0.1 mm Dimensions: height 33 mm / 1.3", thickness 12 mm / 0.47", length 68 mm / 2.68", width 13 mm / 0.51" Material: alloy steel with hardened surface; rust-proof and corrosion-resistant Features Two blade types: both sheets are clearly marked for easy identification and fast switching between convex and concave checks. Conventional template for detecting concave surface arcs; concave template for determining convex surface arcs (templates clearly labeled). Compact size fits easily in toolboxes, inspection kits or on the bench for frequent use. Practical applications (use scenarios) Toolmakers: verify and set the radii on cutting tools, end mills and carbide inserts to ensure consistent cutting geometry. Mold and die making: check cavity and core radii during machining and polishing to meet part specifications. Machine shops and maintenance: inspect finished parts, fillets and transitions on machined components or fixtures to confirm conformity. Why you need this gauge Ensures accurate radius matching and inspection without complicated setup or calibration. Reduces rework and scrap by catching radius deviations early in the process. Durable alloy-steel construction provides long-term reliability in demanding workshop conditions. What you get A compact, hardened alloy-steel radius gauge set with two marked blade types, 17 convex numbers, measuring range 1–7 mm, and ±0.1 mm precision for consistent, repeatable radius checking.