A surgical saw blade guide or milling instrument guide comprising a guide body having a guiding surface thereon, and containing a magnet therein which exerts attractive force in a direction toward the guide body for attracting a bone saw blade or milling instrument to the guiding surface. The surgical saw blade guide or milling instrument guide can comprise a plurality of magnets and the magnet or magnets can themselves form part of the guiding surface. Also, a method of cutting a bone comprising the steps of magnetically attracting a surgical bone saw blade or milling instrument to a surgical saw blade guide or milling instrument guide containing a magnet, actuating a bone saw coupled to the bone saw blade or actuating a milling instrument, advancing the bone saw blade or milling instrument into the bone thereby cutting the bone, and detaching the saw blade or milling instrument from the guide.