Allstar Steel Nitrogen Bottle Holder - Pair have been constructed from quality 1.5 inch steel material. They are hinged for easy replacement of the bottle. They have been designed for use with a 9 1/4 inch diameter nitrogen bottle. The brackets are 17.5 inches in overall length and have mounting holes with 16 inches on-center. They can be attached to any trailer or shop wall to keep the bottle in the upright position and secure. They are sold as one pair and backed by a 90-day limited factory warranty.