The Extended Clamp Arm fits the BeadBuster XB-450i (and old XB-451, 452 & 454 PRO models). It can be installed on these small frame (45x series) tools to be effectively used with certain automotive wheels which have curved or angled clamping surfaces that make the standard, shorter, clamp arm difficult to use. The extended clamp arm will project about 3″ below the feet of the 45X tools, and contact the rim further down where the clamping surface is more parallel to the tool axis. This has been proven to be an effective solution for these difficult rim shapes, but extra care must be taken when clamping because the clamp force will tend to rock the tool backwards, away from the rim, possibly causing the ram foot to miss the bead bundle. The tool still needs to be aligned perpendicular to the face of the rim to properly break the bead; additional care and manual pressure may be required to ensure alignment.