This square is a precision tool manufactured by Shinwa to specific tolerances. In it's 150mm-long form, the blade measures 150mm along it's long edge, is 19mm wide and has a 100mm long base.
We have found this small square excellent for the setting and checking of machinery fences and blades, and as a master square which can be used to check other squares against in the shop. It's weight makes it impractical for every-day use as a woodworking try square, though it's heavy base helps it to stand upright easily for use with flat reference planes.
All Shinwa precision squares ship with a factory warranty of squareness. This model's tolerance to square is +/-17μm along it's blade. If it should not meet these tolerances, it is covered by a factory warranty. Please note that rough handling or dropping of the tool would void this warranty.
This square is beautifully machined from S50C carbon tool steel. It ships from the factory with a protective layer of oil applied. While this needs to be removed before use, we recommend storing this square in it's box or in a location where it can't accumulate dust. If left unprotected for long periods of time, these squares may be susceptible to rust - though none of ours have yet been affected in our workshop.