MGM Torsion Bar Clamps. This clamp fits around the torsion bar stub and torsion bar to clamp down tightly on the chassis to secure the torsion bar in place.
Note: If considering this torsion bar clamp for a kart other than MGM, note that this may or may not fit your kart, as tubing can vary from chassis to chassis. These are manufactured to fit an MGM frame, specifically.