Starrett 6″L x 9″H x 3″T Granite Tri-Square- Grade A Inspection – 81970

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.): A Inspection:.000050″/6″ TIR (0.0012/150mm)
• Made in the U.S.A.

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