modular glass holder

Simple, sturdy glass holder with minimal material requirement. Modular for easy assembly. Suitable for use as a spice rack on the inside of a cabinet door or on the cabinet side. Suitable for glasses up to 80mm in diameter. Designed for standard corn/bean/pea jars with an 80mm diameter. For mounting, 3 screws measuring 3x16mm are required per glass holder. The base of the holders is always the same. For the holder rings, there are 1 left part, 3 middle parts, and 1 right part on two plates. So,