10.5, 13.5 17.5 and I think 21.5 as well. Like I posted on the Ballistic thread I never ever liked Novak products but this one has me looking hard at getting one. Man saying that if you knew well is going to make hell freeze over.

I have to think they would be killer motor in the E4 for fit and maximum motor movement. That small end looks great for fitament in an E4. Black in color don't hurt either as I like black anodize.