This fully adjustable support pole is 3 support poles in one! We supply a male canvas snap, a grommet tip, and a plain end cap with this Super Support Pole. So, if you have a female canvas snap or a grommet on your boat cover, you can get a support that will work with your cover. The pole is aluminum, with a durable plastic adjuster to set the correct height for your cover. Also comes in a 3-piece pole that collapses down to 22" for easy storage.