- Patented locating device automatically positions all heads for quick assembly
- Hardened square and center heads, with double-shoulder reversible beveled protractor head
- Clamp screw assembly is replaceable (#MG280/281-CA)
- Square head has spirit level and hardened scriber
- Etched, high-carbon blade with satin chrome finish
- Meets U.S. Government Specification GGG-S-656C
- Graduations: 4R (Every 8th, 16th, 32nd and 64th of an inch)
- Blade length: 12 in.