iGaging 4" Machinist 4R Double Square
The blades are hardened and tempered, are precision ground on all 4 edges and have precision photo etched markings that are black filled for long life and easy readability. Blades have a satin chrome finish that produces a non-glare surface for easy reading and rust resistance. Angular accuracy is guaranteed to 0.0008 per inch (that's 8 ten thousandths of an inch).
Graduations: 4R (1/8", 1/16", 1/32", 1/64")
WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov