Protect the contents of your feeder with this feeder with guardian the robust metal cage will deter squirrels and large birds from emptying your seed feeder before the smaller birds get a chance to eat the base also acts as a seed catcher tray when turned upside downr each feeder and guardian comes complete with a 10 year guarantee for more information click herer dimensionsr small h 300mm w 185mmr medium h 450mm w 185mm