12" diameter with built in hub for a 3/4" diameter shaft.  The hub is cross drilled for a 1/4" shear pin. The disc has 3 "Top Angled" fins set for a Clock Wise Rotation.

The spinner disc plate is also drilled a full 3/4" to match the hub. This allows the shaft to extend past the bottom of the disc for those odd shafts whose cross hole is higher up on the shaft.

Need a 1" Hub? - order P/N:  SSSD1X12