The Operator Survival Tool – Wrench is a supercharged castle nut wrench. In addition to tightening a castle-nut, it also scrapes carbon from the BCG, bolt, firing pin, and locking lugs. It has a screw driver bit slot, O2 canister wrench and mini pry tool. One of the most unique attributes about the Wrench is that it was designed to be secured to a single loop of MOLLE webbing. We use a durable shock-cord attached to the Wrench to keep it handy. Simply feed the Wrench handle into a single loop of MOLLE webbing, stretch the cord around the handle and let go.