Special Features:

The blade of the starrtt 55 square is beveled on both edges; bevel thickness is 0.015-0.020 inch; material aisi-01 steel; hardness beam 57-63 rockwell c, blade 53-59 rockwell c; finish grain rubbed steel; blade to base squareness 0.0001 inch; beam flatness is to shut out light; lateral squareness 0.008 inch max; length of blade 4.5 inch from the inner edge of the beam to the end of the blade; length of beam 3.5 inch

Properties:

A measuring tool consisting of a onepiece, precision-ground steel body and tongue forming a 90 degree angle. It is graduated on the inside edge of the tongue (short leg) and the outside edge of the body (long leg).