The Starrett S831EZ set of four small hole gauges measures 0.125 to 0.5"/3.2 to 12.7mm holes, slots, grooves, and recesses in woodworking, metalworking, machining, layout, and pattern-making applications. The four gauges measure from 0.125 to 0.2", 0.2 to 0.3", 0.3 to 0.4", and 0.4 to 0.5". Each gauge has a half-ball measuring surface with flat base that is hardened and ground for two-point contact in shallow slots and recesses. A safety stop prevents each gauge from adjustment beyond its range. A lock at the end of the handle secures the gauge width for measurement with a micrometer (sold separately). The gauge set comes in a protective case for storage.

The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.

What's in the Box?

• (4) piece small hole gauge set
• Protective case