Until the 1980s, Modern Furniture Sales (the predecessor of Herman Miller Japan) manufactured Eames shell chairs in Japan under license from Herman Miller in the United States. The shell chairs of that era had their base (legs) size and angle adjusted to suit Japanese living conditions, and spacers were provided to further adjust them. In other words, you could change the angle and fine-tune the height of the chair. This is a set of four spacers and long bolts. The bolts may not fit. This is an old, used item. There are scratches and stains.