This is a rarely seen radio wrench with 16 various features, from a screwdriver, the a threaded screw gage, to a wrench. The largest wrench opening is about 1/2", largest screw gage is 10-32. The wrench is 4.6" long overall with the marking "16 IN 1 RADIO TOOL RA CO. N.Y. PAT. PEND." on it. Very little wear, in very good shape overall!