The Brey Krause Model R-9521 (1.5 in. or 40 mm bar) and R-9522 (1.75 in. bar) Roll Bar Fire Extinguisher Mounts are designed to allow you to mount a fire extinguisher directly to your roll bar or roll cage. Can be used with either a standard Amerex 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.