Simple operation: directly insert the bore gauge into the hole diameter, slot diameter, and pipe inner diameter to measure, and you can get accurate values. Accurate measurement: The mechanical structure is made of carbon steel, and the is chrome-plated to the accuracy and stability of long-term use. Anti-shedding: It adopts rolling pattern, which is not easy to fall off, feels comfortable and increases friction. The tapered feeler gauge is made of carbon steel. The scales on the small head, big head, and cone are used to measure thin-walled parts, plastic pipes, inner diameters, and inner holes. It has the advantages of simple structure, reasonable, convenient and fast measurement. The number on the handle may not be there, hope to understand Colour:Red & Silver Material:carbon steel Size:Approximately 260mm in total length Package Contents: 1 * 3-15mmBore gauge Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.