Part Number: UGV Suspension (A) All-metal Compact UGV Suspension (A), High-strength Spring, 7.5KG Load Capacity, Suitable for DDSM115 Hub Motor Comes with 20 Series European Standard T-nuts for Users to Install the suspension on Aluminum Profile. Provides An Open-source Profile Chassis Model for Secondary Development For advanced users, the suspension can be installed by cutting holes on the side of the chassis body, and we also provide an open source model of fully enclosed chassis Adopts 6061 Aluminum Alloy CNC Process, with high-durability 65Mn* Spring, Ensuring the Overall Strength while making the structure more compact, saving more chassis space