Don't get caught fumbling with your extinguisher during a blaze! Sector Seven’s quick release mount secures your fire extinguisher to most roll bars with 1.25"-2" diameters and gives you immediate one handed access in the event of an emergency. Simply roll the safety tab back push the switch to release! Plus, it’s compatible with most doors and windows. Precision engineered and machined from billet aluminum for durability and a lifetime of rattle-free use. Fits 3″ diameter fire extinguishers including Amerex B417 ABC dry chemical fire extinguisher, Amerex B385TS Halotron (clean agent) fire extinguisher & H3R MX250R ABC dry chemical fire extinguishers. Fire Extinguisher not included, may be purchased separately. Fire extinguisher: Amerex 2.5 lbs ABC, Multi-Purpose or Tri-Class fire extinguishers utilize a specially fluidized and siliconized mono ammonium phosphate dry chemical. It chemically insulates Class A fires by melting at approximately 350°F and coats surface to which it is applied. These ABC dry chemical fire extinguishers smother and break the chain reaction of Class B fires and will not conduct electricity back to the operator.