These reels feature an enclosed factory tuned & matched cartridge-style spring motor & 1" OD non-corrosive stainless steel rollers. The sturdy box-style frame with heavy duty steel cross supports to all four corners add extra rigidty. Low profile outlet riser & open drum slot design provide a non-crimping, flat smooth hose wrap. Models with both vacuum & air have an airline capacity of 1/2" x 50ft 300psi.