The SPI Gage Block Base Block is a precision measurement tool designed for use with rectangular gage blocks in dimensional measurement applications. With an overall length of 4 inches, this base block provides a stable foundation for your measurement setup. Engineered with exceptional accuracy of +/-0.00002 inch, this tool ensures reliable and consistent measurements for quality control and inspection tasks. Manufactured by MSC Industrial under the trusted SPI brand, this single-piece base block is an essential component for metrology labs, manufacturing facilities, and quality assurance departments where precise dimensional measurements are critical. The durable construction and precise machining make this base block a dependable addition to your measurement toolkit, helping you achieve consistent and accurate results when working with gage block setups.