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. 5、100% brand new and high quality. 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. 5. 100% brand new and high quality. Specification: Condition: 100% Brand New Product Name: Caliper Material: Stainless steel Caliper size: about 150mm (6 inch) Usage: measurement Package list: 2 * Calipers