Made from hardened spring steel. Rigid blade is 24" long, .040” thick and 1” wide Rule is precision photo etched and black filled for long life and easy readability Graduated with quick reading 1/8" and 1/16" increments on one side and 1/32" and 1/64" on the other Brushed finish Rigid machinist rule made from hardened spring steel. Blade is .040” thick and 1” wide. Both sides of the blade are ground parallel and straight. Rule is precision photo etched and black filled for long life and easy readability. Graduated with quick reading 1/8" and 1/16" increments on one side and 1/32" and 1/64" on the other side. Brushed finish.