Used on airplane,utility,u-21 (beech)+ airplane,reconnaissance,utility,ru-21 (beech). 0.690" inside diameter 0.562" overall width thumb head screw thumbgrip drilled 0.070 in. hole 0.250 in. from center for a lockwire cadmium thumbscrew surface treated band
Used on stratolifter c-133 aircraft. 0.688" inside diameter 0.562" overall width thumb head screw thumbgrip drilled 0.070 in. hole, 0.250 in. from center, for lockwire cadmium thumbscrew surface treated band