Stainless Steel Ruler for Working at Height Here at Secure Tools, we provide a selection of top-quality stainless steel rulers for working at height safely and accurately. Available in 6-inch and 12-inch sizes, the rulers include both imperial and metric measurements engraved. Their robust, stainless steel design is effective in resisting corrosion, making the rulers capable of standing up to a lifetime of arduous environments, such as rigging and marine work. Plus, each stainless steel ruler is equipped with a sturdy open ring attachment, to give you a fixed point of tether. This useful feature is highly effective in preventing dangerous tool droppages when working from height.