Performance Tool W8655 Combination Thread Pitch Gauge - Standard and Metric, 60 Degree Angle, Quality Construction for Accurate Readings.

Used to determining thread per inch/cm on screws, bolts or in a Tapped holes.
Combination thread pitch gauge, includes 28 standard and 24 metric thread gauges.
Both SAE and metric conveniently divided in one metal holder, stop hunting for the correct one.
Quality construction for a long life and accurate readings. Common thread angle, 60 DEG.
SAE gauge: 4 to 62 threads per inch. Metric gauge: 0.25 to 6.0 threads per cm.