Set of Two 6" Heavy-Gauge Stainless Steel 1/20 Scale Rulers - Metric & SAE + Conversion Table Two heavy-duty 22 ga. stainless steel scale rulers for engineers, drafters, architects & students Inch side marked by 1/10, 1/20 and 1/50-inch to 6" Metric by 0.5mm, 1.0mm and centimeters to 15.5cm Features a handy conversion table on the reverse side for: millimeters, WW-UNF, TAP & drill size Easy-read engraved markings in black; 3/4" width, 6-1/2" length overall