印度尼西亚采购需求：井盖、井踏、井盖表面、沟箅、圆形井盖、方形井盖

I'm looking for detailed information on your 20cm drainage product. Specifically, I'd like to know about the materials used in its construction, any certifications it holds, and the weight capacity it can handle. Additionally, please provide details on the types of installations it supports and any relevant specifications, such as drainage flow rates and dimensions. It would also be helpful to understand your pricing structure, including bulk purchase options and lead times for delivery. If you have any product literature, catalogues, or installation guides available, please share those as well. I'm eager to compare your offering with other suppliers, so any additional insights into its performance and warranty options would be greatly appreciated. Thank you!