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This is a Nerf Rival tactical rail to Picatinny rail adapter. It lets you convert the tactical rail on your Nerf Rival toy gun to a Picatinny rail for attaching airsoft/paintball/firearm accessories. For example, if you have a red dot sight that fits Picatinny rails, but won't fit the Nerf Rival tactical rail, you can use this DartToys3D adapter to make it work.
You will also need a #6-32x1-1/4" screw and a #6-32 nut to fasten this mount to the Nerf Rival tactical accessory rail. The screws and nuts are not included, but can be easily sourced from your local hardware store (e.g. Home Depot, Lowes, etc.). You may also order them through the following Amazon links: