OneTIME Tool - 45-90 SS Triangles - The 45-90 SS (stainless steel) Triangles feature two different degree scales. One scale is engraved along the outside edge of the hypotenuse in 1° increments. When using this scale, the reference point is the outside edge of the triangle’s square (90°) corner. The second scale uses precise, laser cut diamond shapes for can’t miss marking. When using this scale the reference point is the triangle’s inside 90° corner.