This is a display base or stand.
With its base shaped like the insignia of the Earth Federation Space Force (E.F.S.F.), this yellow Action Base is designed to hold kits from Bandai's line of 1/144-scale, 1/100-scale, HG, and MG models of E.F.S.F. Mobile Suits.
Action Base 1 E.F.S.F. Version is a plastic injection snap-fit assembly kit that requires very little work to assemble. No cement or paint required! The support pole has an ingenious locking mechanism that allows it to extend or retract and is strong enough to hold the main stand in place. The main stand itself can also be extended upwards to pose your kit in a much higher position. Both the support pole and main stand are molded in black.
The set comes with three different sizes (8mm, 9mm, and 11mm) of U-shaped holders, peg-type holders, and screw-on type holders (two screws and a nut are included) for attaching the main stand to the crotch of the kit. (The package notes that there may be cases of a kit not able to fit.)