Use this spinner to polish barrels up to 32" long and magazine tubes. Simple to use, just secure the barrel between the non-marring Derlin centers and place the barrel against a motorized buffing wheel. The barrel will rotate in the spinner and can then be moved around for even polishing. Aluminum frame is 36" long, will accept up to 32" long barrels. Support arms are 4 1/2" long, secured with socket head lock screws, 1 1/2" spacing from barrel to spinner.To use, secure barrel in place, then hold spinner and place barrel against a motorized buffing wheel. The barrel will rotate in the spinner and can then be moved around for even polishing.