Screw pitch gauge 22 blades 60° UNC 4-64

For inside and outside measurement with locking screw.

Big head: 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6.5 | 4.5 | 4
Small head: 64 | 56 | 48 | 40 | 30 | 24 | 22 | 20 | 18 | 16 | 14