Check out these mirror polished stainless steel a-arm skid plates. They snap over your stock rear a-arms and attach with stainless hardware in 3 locations. Not only to protect you’re a-arms but stiffen them as well. Includes hardware, instructions and a drill bit needed for installation. On newer style a-arms coming from hpi, you will need to sand or grind down the bottom of you’re a-arms slightly to make a flat surface for the covers to sit against. But don’t worry, these covers will increase the strength of you’re a-arms dramatically.