L1 gages check the effective diameter at the gage line.L2 external and L3 internal check the remaining thread length and the taper. Gages are available with or without handles or holders. Dryseal and Aeronautical threads are checked for conformance with these plug or ring gages to insure conformance to specifications.
Made to ANSI B 22 specifications
Conform to Mil-P- 7105 Military Standards