The R-9521 is designed to allow you to mount a fire extinguisher directly to your roll bar or roll cage. The R-9521 can be used with either a standard 2.5 lb fire extinguisher mount or the R-9520 quick release mount. All aluminum construction makes for a safe mount that doesn’t add a lot of weight to your car. Don’t let a poorly secured fire extinguisher ruin your next trip to the track. Safety inspectors aren’t letting them pass and neither should you.