Starrett RS81B MicroAccurate Gage Block Set is a B-grade, rectangular steel gage block collection from Starrett Global, consisting of 81 blocks that span 0.1001 in to 4.000 in. As part of the MicroAccurate inch-system family, this set serves as a compact reference standard for calibrating and verifying calipers, micrometers, height gauges, and other inspection instruments in metrology labs and manufacturing environments. Constructed from durable steel for long-term use, these blocks provide reliable, repeatable measurements across routine calibration tasks in quality control and machine shop applications.
