HPI Racing 86058 Dogbone 9x123mm Black (2) Savage 21 / savage X 4.6 N Sets The HS-311 sport servo provides

The HS-311 sport servo provides the novice modeler all the performance and reliability you would expect to find in a more expensive servo

including a small child wearing water wings

or special tools

Here's 4 Pieces of Bachmann's HO Nickel Silver Curved E-Z Track w/Gray Roadbed

HPI Racing 86058 Dogbone 9x123mm Black (2) Savage 21 / savage X 4.6 N Sets The HS-311 sport servo providesHPI Racing 86058 Dogbone 9x123mm Black (2) Savage 21 savage X 4. 6 These are the stock Dogbones for the HPI Savage Truck. These are also referred to as swingshafts. FEATURES: Steel construction, black in color INCLUDES: Two stock Dogbones for the HPI Savage Truck SPECS: Ball Diameter: 0. 35" (9mm) Length: 4. 8" (123mm)