Drive hub for X-6 and X-10 crank drives with standard 6-pin input shaft.
Standard hubs bolt to dampers w/ 3.20" bolt circle and 2.275" female pilot (BB Chevy and aftermarket dampers for misc. applications using Innovators West Dampers #102, 106, 207, 213, 845)
"BDS/Hemi" hubs are for use with a 2.771" bolt circle and a 2.00" male pilot (common on HEMI & 481X applications)