we use mostly Technics holders and they can be download as a solid.
one thing you need to do is edit the solid and cut the taper off at the gage line.other wise it will display the the taper hanging out of the spindle
mine are between 1 an d 2 gig. one thing I found was if at all possible DO NOT use solid geometry in your tool paths, it will kill the regen time
I always create curves and surfaces and drive the path from that