Starrett C637-150 Spring Tempered Steel Rule With Millimeter Graduations, 150mm Length, 19mm Width, 1.2mm Thickness

This Starrett spring-tempered stainless steel rule has photo-engraved graduations in millimeters and a satin-chrome finish for measuring in woodworking, carpentry, and machining applications. Its graduations are in millimeters and half millimeters on both sides. They are photo engraved for accuracy and staggered in a height pattern for readability. The spring-tempered stainless steel body construction is fully flexible for durability and flexibility. The satin chrome finish aids readability and provides rust resistance.

Rules are devices used to measure distances, or to rule straight lines. Rules have markings at specified intervals (also called graduations), as opposed to straight edges, which lack graduations and are used solely to draw a straight line. Nearly all rules are straight edges, except for rounded rules used to measure circles and arcs of angles in geometry applications. Rules can vary from high-quality steel instruments used by machinists; to retractable rules (also called tape measures) used in carpentry and for home-use; to simple wooden or plastic rules used in primary and secondary schools.

The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment, and saw blade products. The company, founded in 1880, is headquartered in Athol, MA.