Pro Steel Safety Ruler - 28" Pro Steel Safety Ruler - 28" The tool steel is .069" thick by 1.25" wide, It is joined to the base and protrudes from the side of the ruler Trim straight with what we think is the world's best safety ruler Steel is the ideal edge for razor straight trimming, your blade slips along the steel with a high degree of accuracy The stainless steel edge is low and flat, so your blade won't wobble