Fowler 52-431-003-0 3-1/8" Straight Edge Square

3-1/8" Straight Edge Square 

Features:

• Length of the blade is measured from the inner edge of beam to end of blades.
• Squares fully hardened to Rockwell 55C.
• Beams and blades are ground and lapped for straightness and parallelism.
• Both the inside and outside of the squares have accurate right angles.
• Packed in individual cartons.
• Designed for precision layout and measurement work which requires high accuracy.
• Accuracy = .0002" + Length (blade)/50,000