COMBO SQUARE: This Johnson combination square was designed with maximum accuracy in mind - its square head is CNC machined for greater accuracy. STAINLESS BLADE: This combination square has a stainless steel blade with etched graduations in 1/8", 1/16", and 1/32"; as well as millimeter graduations that are permanently imprinted so they will never fade or degrade ACCURATE MEASUREMENTS: Auto-Lock blade assembly ensures precise alignment for optimal tool performance APPLICATIONS: Ideal machinist's square; straightedge; adjustable try square; miter square; marking gauge; and depth gauge PRODUCT SPECIFICATIONS: Accurately measure 45° and 90°, mark miter cuts and find depth as well as simple distance measurements. Built-in level vial for checking level and plumb