HI-LOW Thread "Setting" Plug Gages

HILO set plugs take the guesswork out of setting high and low tolerances on adjustable thread ring gages. These unique setting plugs are designed with two different thread pitch diameters. The front portion is the low tolerance limit, and the back portion is the high tolerance limit. By adjusting the ring gage so it will thread onto the front portion without threading more than 1½ turns onto the back portion, a precise setting is achieved.