Super D here.....This is a three piece file that by using store boughten 5/16 lag bolts you can print out a neat spinner combination that can be used for many things including feeding the Squirrels or wildlife along a trial. Use as a trail marker. Mount wooden blades or orimental windmill wind turbine center connector nut. A pocket pull of these with a bag of bolts you certainly can get wildlife to come by They fight over Mine.