Specifications：

- Sizes: 5/16" - 6" Range.(5/16" - 1/2"; 1/2" - 3/4"; 3/4" - 1-1/4";1-1/4" - 2-1/8"; 2-1/8" - 3-1/2"; 3-1/2" - 6" )
- Material: It is made of carbon steel with chrome plating on the surface.

Features：

1. How to Use: Use the gauge to expand in the hole to be measured, lock it in place, and then take it down, and measure with micrometer or caliper to determine the final hole size.
2. The telescopic spring piston in the hole (or groove) can be used for inner diameter detection, used in conjunction with a micrometer or caliper, and has a knurled locking device. The rigid handle and double acting design (automatic centering) can quickly check the internal dimension. The spring tension is constant and the hand feel is even.

Package Included：

6PCS telescoping gage with a storage box,easy to maintain and store