The Mayes 6" Combination Square acts as a depth gauge, vertical level, horizontal level all in one. It has a heavy duty die cast zinc head with a precision stainless steel etched blade. A high impact vial is made to withstand long-term use. This compact tool features graduations in 1/32", 1/16", 1/8", &millimeters, &is accurate to within .001"& gives accurate 90 &45 readings.It includes a hardened removable scribe for marking surfaces.Agoodversatile combination square & a good tool for a wide variety of projects.