马来西亚采购需求：排水框架、排水盖、雨水篦子、沟槽篦子、下水道篦子、铸铁篦子

I'm looking to procure drainage covers and would appreciate more detail regarding your offerings. Could you provide information on available sizes, materials, and load ratings? It's important to understand the various options you have in stock. Additionally, please share your pricing structure, including any bulk order discounts. Let me know about lead times for production and shipping, as well as any guarantees or certifications that come with your products. Looking forward to your detailed response!