Our engineer squares with stainless steel rules are the ideal choice for setting up machinery like table saw blades, jointer knives and fences. Accurate to .002". Great for marking stock for joints or checking stock for squareness. Both squares are notched where the beam and rule meet for drawing accurate layout lines. With two rules for inside and outside measurements. PLUS, we"ve added 1/16" etched markings on one side of the rule for precision marking, perfect for detail work in joinery!