Small thread repair insert for M4 bolts, fixes damaged threads in compact spaces.

Thread repair insert for restoring M4 threads in industrial and mechanical applications.

Thread plug gauge for checking M4 bolt thread quality and pitch diameter accuracy.

Precision ring thread gauge for M4 x 0.7 metric threads with calibration certificate.

Thread repair insert for fixing damaged M4 threads in metal.

Restores damaged M4 threads for secure fastening in machinery and metal components.

Calibrated plug gauge for checking small M4 metric thread specifications.

Black nylon terminal post for low-voltage testing up to 10 amperes.

No-go ring thread gauge for M4 fastener verification and quality inspection.

Black 10-amp 125V terminal post for light-duty testing.