Craftsman 9-4031 screw pitch gauge
Vintage!!!!Range: Measures pitches from 4 to 84 TPI. Construction: Features a steel case with folding leaves, each marked with a specific pitch. Locking Mechanism: Includes a locking device to secure leaves in position for use. Markings: Marked with CRAFTSMAN 9-4031 4 TO 84 SCREW PITCH GAGE ENGLAND. Usage: Helps machinists and engineers accurately determine thread size.