Starrett C636-300 Spring Tempered Steel Rule With Millimeter And Inch Graduations, 300mm Length, 25.4mm Width, 1.2mm Thickness Precision rule with inch and millimeter graduations for measuring in woodworking, carpentry, and machining applications Graduations in 32nds of an inch and half millimeters on one side and 64ths of an inch and millimeters on the opposite side are photo engraved for accuracy and staggered in a height pattern for readability Spring-tempered stainless steel body construction is fully flexible for durability and flexibility Satin chrome finish for readability and rust resistance