Made of hardened steel.
Protractor graduations include 30, 45 and 60º angles.
Base surface measures 2-1/2" x 1/8" thick with deeply etched, quick-reading markings.
6" non-graduated 3/32" steel rod included for measuring holes too narrow for use with the rule.
Graduation: 32nds and 64ths, .05mm and 1mm.