Metric Thread Gauge Metric thread gauge for standard 60 degree pitch metric threads. 20 blades.Size range 0.5mm through 7mm. Includes gauges for the following metric thread sizes: 0.5mm, 0.6mm, 0.7mm, 0.75mm, 0.8mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm