This is a very nice, used Master Planer Gauge marked THE LUFKIN RULE CO. SAGINAW MICH. MADE IN USA NO. 900. It is in very good condition with a working level. It has a some tiny minor staining spots and the previous owner's name neatly engraved on one the side. Included is one 3.000" extension shaft, and the round shaft are threaded, so they can be attached in both vertical and horizontal positions. The purpose of this tool is to be able to set a dimension with a height gage or micrometer, by sliding the angular slide either up or down and securing it at the correct dimension, then the dimension can be transferred to another application. Lufkin no longer makes this tool, it still has useful purpose in toolmaking today, this one is from around 1945. We have many Lufkin tools for sale at this site, as the machinist tools are no longer being manufactured, they have become collectible. Lufkin made very good quality precision tools over the years, this being a fine example of quality tooling.