2.688" hole diameter 3.500" outside diameter 0.089" material thickness with 18ea holes 0.156in.dia. equally spaced throughout the circumference on a 3.125in.dia. key
0.104" hole diameter 0.245" outside diameter 0.0388" material thickness 0.054 in. rad 0.125 in. from center opposite slot oxide film surface treated slotted