This GPM SAV1054C kit is an alloy front and rear adjustable upper arm solution for HPI Savage, Savage X, Savage XL and Savage K4.6. Supplied components include titanium tie rods, Delrin collars, screws and a hex wrench to support accurate link length adjustment and reliable joint performance. The selection of titanium for link rods and Delrin for collars provides improved wear resistance and consistent adjustment behavior under heavy use.