This is the Duratrax Replacement 23mm Screw Pins for the Maximum ST Truck (DTXC0055). FEATURES: Made of Steel and Also Called the Hinge Pins Holds Parts Without the Need for E-Clips 3mm Thick and Threaded Next to the Screw Head INCLUDES: Four Screw Pins 23mm (part #54) COMMENTS: This is the front & rear lower outer pins The suspension arms is DTXC9551 The rear hub is DTXC8001, front hub carrier is DTXC8050 Other screw (hinge) pins: DTXC8600 13.5mm for front upper outer camber for DTXC8610 23mm for front & rear lower outer DTXC8620 55mm (screw pin arm) front & rear inner AXY 11/17/98 ir/jl this information was sourced from Great Planes Model Distributors