Starrett, 57033, O1 Oil-Hardening Flat Stock: 5/8" Thick, 1-1/4" Wide, 18" Long, +0.0100 to 0.015" Thickness Tolerance 1/4" Long Tolerance, + 0.01 - 0.015" Wide Tolerance, + 0.01 - 0.015" Thick Tolerance