These spuds are CNC-machined from stainless-steel billet. Male-and-female design allows the two halves to be tightened completely and provides the correct amount of crush on the urethane motor-mount bushings and steel sleeves. The internal hex machined into the end makes tightening easy. Polished finish for great, long-lasting appearance. Use with 6007-X (LS-Series) and 6055-X (Chevrolet side mount) billet motor mounts.