Features Stainless Steel Joint Calipers: These joint calipers are made of high-quality stainless steel, which is strong, rust-proof and durable. Durable and practical measuring tools, easy to learn and use quickly. Joint Caliper Measuring Tool Set:Joint caliper is a tool for measuring length, the outer caliper is used to measure the outer diameter of a cylinder or the length of an object, and the inner caliper is used to measure the inner diameter or groove width of a cylindrical hole. High Quality Sturdy Joint Calipers: Stainless steel calipers are rigorously tested for safety and quality before leaving the factory to ensure the best quality. Product Features: Calipers are tools for measuring length, which are divided into watchless calipers and watch calipers. The method of use is the steel ruler size method and the caliper measurement method. Note: Due to manual measurement, please allow slight errors. Thank you for your understanding, I wish you a happy shopping, thank you! The caliper is a tool for measuring the length, which is divided into a tableless caliper and a table caliper. The method of use is a steel ruler size method and a caliper measurement method. The outer caliper is used to measure the outer diameter of the cylinder or the length of the object. The inner caliper is used to measure the inner diameter or groove width of the cylindrical hole. Features: 1. Made of high quality stainless steel, solid ,anti-rust and durable. 2. The caliper is a tool for measuring the length. 3. The outer caliper is used to measure the outer diameter of the cylinder or the length of the object. 4. The inner caliper is used to measure the inner diameter or groove width of the cylindrical hole. Specification: Product Name: Caliper Material: Stainless steel Caliper size: about 150mm (6 inch) Usage: measurement Package list: 2 * Calipers Package List