Starrett C33H-12-4R 12-Inch Combination Square with Square Head Only With reversible lock bolt, scriber, spirit level Graduation: No. 4R - 1/8", 1/16", quick reading 1/32", 1/64" The square head are forged hardened steel with smooth black enamel finish Square blade easy-to-read, sharp graduation Bearing surface is accurately ground A multi-purpose tool that can be used for applications that require a 45-degree miter, a depth gage, a level, a plumb, and a precision rule Square blades are machine divided, hardened and tempered for long life Features easy-to-read, sharp 8ths, 16ths, 32nds, and 64ths graduations A reversible lock bold allows the blade to be turned over or end-for-end, without removing the lock bold or nut to ensure true alignment of the blade and heads Protractor heads have revolving turrets with direct-reading double graduations, 0-180-degrees in opposite directions, for the direct reading of angles and supplementary angles