Starrett Three Face Granite Tri-Squares

Three-Face Granite Tri-Squares provide an excellent, economical way to check X, Y and Z axis alignment on CNCs and CMMs. They can also be used in the same way as a steel square for direct checking of squareness and straightness.

Laying in the horizontal position, the X and Y axes can be checked for 90 squareness. With the square in the vertical position, tracing along the vertical edge of the square can check the perpendicularity of the Z axis.

• Grade (U.S.): AA Laboratory Squares: .000025″/6″ TIR (0.0006/150mm)
• Grade (U.S.) A Inspection Squares:.000050″/6″ TIR (0.0012/150mm)
• Made in the U.S.A.