Special Features:

Calibrated to be flat within 0.0002 in. (0.005 mm) per running foot length; use with feeler gauges to check for distortion in engine blocks, cylinder heads, flywheels, main bearing saddles, cam bearing housings; with hang hole and edge protector

Properties:

A bar or slip of wood, metal, or plastic, having one or more long edges made straight within a desired degree of accuracy. It is used for testing straight lines or surfaces, drawing straight lines, and the like. Straightedges having one beveled edge may be graduated on the beveled edge. Excludes straightedge, parallel ruling, guide cord; scale (as modified); rule (as modified) and ruler (as modified).