High-precision long gauge block set: Designed for calibrating measuring tools like calipers and micrometers. Wide length range included: Offers various sizes for flexible measurement and stacking applications. Premium hardened steel construction: Provides excellent wear resistance and durability for lab and industrial use. Conforms to metrology standards: Each block is finely machined for dimensional stability and repeatable accuracy. for calibration and inspection: for quality control, tool verification, machining setups, and metrology labs., Manufacturer: CFWWSAQ