Housing studs, washers, and nuts complete the package for your racing or street use 9" axle. Used to attach the 3rd member (pumpkin) to the rearend housing, works with 8" and 9" rear axles. This kit includes studs, washers, and nuts. Side bell thru bolts torque to 40-45 lbs. Knurl diameter .398-.403" Knurl .398-.403 dia need 25/64(.390) drill. in set 728-16530.