This item is an accessory or set of accessories for Gundam models.
Assembly Guide
Here's a super-detailed set of hands molded in color in the poses shown below (the photo shows the hands cleaned up and assembled; you'll need to do that yourself). Intended for use with Bandai's 1/100-scale Master Grade Zeta Gundam Ver. 2.0 (linked below) and other AEUG mobile suits.