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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 accessories. For example, if you have a red dot sight that fits Picatinny rails, you can use this Blasters3D adapter to make it work on your Nerf Rival blaster.
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: