Characteristics: The document describes round aluminium grilles designed for flush-fitting installations. These grilles come with a mesh and are available in various sizes.

Specifications: The grilles are available in different diameters, with specific measurements provided for each size. The document lists the outer diameter (Ø D), inner diameter (Ø d), height (H), and weight (KG) for each grille size.

Sizes and Quantities: The document provides a table detailing the available sizes and the corresponding number of pieces per package. Sizes range from 100 mm to 400 mm in diameter, with the number of pieces decreasing as the size increases.

Drawings and Prices: Although not detailed in the text, the document mentions the availability of drawings and prices, indicating that these are likely provided elsewhere or upon request.