Product review (5 stars): Perfect fit. No tools needed. Installs in less than 1 second!
Perfect fit for the "InSinkErator" garbage disposal hole in your kitchen sink.  No tools needed. Installs in seconds.  You literally just put this in the hole of the sink and it fits over the existing (assumed damaged) guard.  Your sink itself should say "InSinkErator" right around the hole that leads into the garbage disposal.