It's a spacers kit for quadcopter ZMR250.
Allows to place ESC between bottom plates.
It required additionally 8 M3 bolts (~18-20mm length)
It is printed as one part to have minimum price. Just break it into parts and assemble your ZMR250 quad.
Depends on print quality it may required to drill holes with 3 or 3.2mm drill.
Please write a comment if you need some other color or material for this item.