This ULTIMATE® Upgrade Series Version 2 gearbox shell is cast in high-strength materials to ensure the box can handle the stresses that upgrades will exert on the box. Each gearbox includes high performance, 8mm steel bearings, equipped with taps controlling the lining of the case. This helps prevent the case twisting under pressure. Each gearbox is uniquely numbered and also comes with an ULTIMATE selector plate and constructed with high-strength hex screws. Features: Unique serial numbers High strength hex-screws High performance 8mm steel bearings ULTIMATE® selector plate Low friction chromium plating
