1,consistent quality control 2,low friction coefficient 3,various sizes and types 4,made-to-order service available type1 metric---pin gauge:Size range 0.10mm ~ 100.00mm;interval of 0.01mm, 0.02mm, 0.025mm, 0.05mm, 0.10mm, 0.50mm, 1.00mm, etc.; accuracy : ± 0.001mm, ± 0.002mm, ± 0.0005mm…2 inch----pin gauge:Size range 0.011in ~ 2.000in;Size pitch: 0.001in, 0.0005in, etc.,Accuracy: ± 0.001mm, ± 0. ...