Staedtler English Ruler. 12.0″ Length – Metric Measuring System – Stainless Steel. Stainless steel imperial/metric ruler is ideal for measuring, cutting and ruling. Nonslip cork backing on all except the 6 ruler provides traction and lifts blade for smudge-free inking. Ruler provides precision calibrations on one side only, with imperial 16ths on top edge and metric millimeters on bottom edge. Stainless steel ruler comes with a protective plastic sleeve.