Product Description This is a wide-range flat washer, also known as "apron washer" or DIN 9021 washer. Its main function is to significantly increase the support surface of the bolt or screw (M6), thus distributing the load on a larger area and reducing the specific pressure on the material below. This is essential for fixing on soft materials such as wood or to cover larger holes than normal. It is made of sturdy steel and treated with galvanizing to offer good resistance to corrosion and oxidation. (499 characters) Technical Specifications Type: Larga Foam Washer (Grembialina). Regulation: DIN 9021 (equivalent to ISO 7093 / UNI 6593). Material: Carbon steel. Superficial treatment: Galvanic Zincatura (corrosion resistance). Internal diameter (for screw): Suitable for screws and bolts M6 (about $\phi\ 6,4 \text{ mm}$ ). External diameter: 30 mm. Nominal thickness: 2 mm (typical value for this size). Durability (typical): 140 HV. Function: Load distribution and surface protection.