Lithco Safety Ruler & Lithco Pro Safety Ruler Provides an extra margin of safety during hand-trimming operations The Safety Ruler is a combination ruler/straight edge. A curved aluminum guard prevents your knife from accidentally cutting your fingers. Space age technology produces a laser rstraight cutting edge. Ideal for sign making and large format digital imaging. . Solid aluminum alloy body features an extra-thick cutting face . Extra-wide 2.6" ruler gives a generous 2" comfort grip . Hand easily fits inside the gently curved finger guard . Non-slip rubber gripper material on back side . Unique transparent sliding marker moves along the ruler scale . Steel measuring scale extends out to measure objects longer than the ruler . Scale is solvent-proof and graduated in 1/16" increments . Built-in handle for easy pick-up . Pro Safety Ruler features a hardened stainless steel cutting face for durability and a superior non-slip backing