Composite drive shaft assembly. This driveshaft is assembled with 316 stainless steel hardware and hubs. The Max HP at a 2.0 Service Factor is 100 at 1,800 RPM and 85 at 1,500 RPM The max DBSE (in.) is 107 at 1,800 RPM and 119 at 1,500 RPM. Custom bores are included with purchase in the standard range of bore sizes. Larger bores are available at additional cost.