Lumber ruler for wood grading

Measures lumber content in terms of board feet. Flexible hickory shaft; hardened, stainless steel head with sharpened pre-bent points for grabbing lumber. First 6" from head graduated to inches and eighths for measuring lumber thickness. Walnut wedge handle. Black graduations protected by polyurethane coating. Four-line rule. For "odd and even" lengths, 9-11-13-15 foot lumber lengths and 10-12-14-16 foot lumber lengths. RC203N Rule shaft: 1 1/16" X 24" RC200N Rule shaft: 1 1/16" X 36" RC400NR Rule shaft: 1 1/16" X 36" RC400N Rule shaft: 1 1/16" X 36"