This item is the universal mount onto which you place any of the available frames that can be additionally purchased.  If you bought the P-Box starter kit, you would have received two universal mounts (one for each of the frames you selected in your kit).  This item allows you to purchase additional mounts for additional frames you may purchase.  This will allow you to add more frames to your P-Box platform.

There are two versions of this mount available.  One holds the frame at a 30 degree angle.  The other holds the frame at a 60 degree angle.  You may select either when purchasing a mount.

Screws and stainless steel washer is included with this P-Box mount.

Note that the platforms are not included, this is for one 30 or 60 degree mount with screw/washer only.