Meets or exceeds U.S. Federal Specification GGG-P-463c and ASME B89.3.7 2013 for flatness.

Best surface hardness and wear resistance - The highest percentage of quartz crystals of any granite plate.

Smooth, jewel-like quartz bearing points protect accuracy and finish of both the surface and the tools used on it.

Quality and economy combined.

Comparable to black granite plates while outwearing them as much as 5 to 1.

Meets or exceeds 50 lb per square foot (24kg per 1,000 sq. cm) load bearing specifications. Available in 100 lb (45kg) test series.

Standard-size plates are mounted on resilient support pads, providing isolation from normal vibration and a non-distorting 3-point suspension.

Packed one per crate with skids for forklift handling.Starrett Surface Gages are designed for a wide variety of uses. This is a basic tool for machinists and toolmakers. The main uses are for accurately scribing lines, transferring measurements and for probing surfaces in inspection work. 12" Spindle.