- Made of high-quality, heat treated alloy steel
- Provides one of the most reliable 90° reference standards available.
- Periphery is ground between centers, straight and round within the tolerance specified for each size, with an extremely fine micro finish.
- Recessed ends, provided with self-cleaning dirt grooves, are ground and lapped square with the axis.
- Supplied in a finished wood case with hinged cover.
- (9143-36) and (9143-48) sizes available - Price Upon Request
