Upgrade accessory set includes upper and lower arms, front and rear steering cup, front and rear shocks tower, servo arm, and mounting screws. This RC car metal upgrade accessories set is made of strong aluminum, offering solid and durable performance. These RC car parts are designed to improve performance, are easy to install, and can strengthen the rigidity of the body to prevent deformation. These spare parts are compatible with Wltoys 1/28 284161, 284010, 284131, K989, K979, K969, P929, and P939 models. Specifications: Material: Aluminum Pull Rod: 4.73cm / 1.86inch Hole to Hole: 4.1cm / 1.61inch Adjustable Length: 5.1cm / 2.01inch Steering Rod: 2.2cm / 0.87inch Hole to Hole: 1.6cm / 0.63inch Adjustable Length: 2.4cm / 0.94inch Lower Arms: 1.6cm / 0.63inch Hole to Hole: 1.1cm / 0.43inch Upper Arms: 1.9cm / 0.75inch Adjustable: 2.1cm / 0.83inch Package Includes: 4 Upper Arms 4 Lower Arms 2 Front Steering Cups 2 Rear Steering Cups 4 Front and Rear Shock Towers 1 Servo Arm 1 Set Mounting Screws