This Heavy Duty Aluminum Pinion/Clutch Mount is a machined alloy option part for HPI Baja 1/5th scale vehicles. This is an authentic HPI bolt-in upgrade part that is precision built to the exact factory specifications for a perfect fit. Heavy duty aluminum construction helps give the pinion gear and clutch extra support for improved durability and longer gear life. The mount comes with two rubber sealed ball bearings (B097) that have a larger outside diameter for high efficiency and long life. Machined from billet aluminum and gunmetal anodized for a custom look.