Electric vehicles and help cars can’t be installed, don’t shoot, Carbon steel model with rear car 20 or less+fast -disassembling axis, Stainless steel model with 16 -inch or below+front car thread, Stainless steel model with 16 -inch or below+fast disassembly (or thread), Stainless steel model with 20 inches or below+front car thread, Stainless steel model with 20 inches or below+fast -disassembly (or thread)