Our Industrial Steel Rules are built to withstand the rigors of day-to-day use in the field. Available in 6, 12 and 18 in. lengths, these high-quality rules feature etched black graduations for easy reading and long life. Choose between polished stainless steel and satin chrome finishes. Grads: Side 1 (HO, S, O Gage), Side 2 (mm, 64 N Dec.).