Stainless Steel Ruler &ndash; Centering &ndash; 18 Millimeter Wide X 30 Centimeter Long from Zero (60 Centimeter Overall) &ndash; Metric &ndash; 1mm Grads Centering Ruler, Zero mark in the middle 30cm long in each direction from Zero (60cm long overall) 1mm graduations on both ruler edges 18mm wide ruler Made of flat 0.020 thick stainless steel