格陵兰采购需求：停车柱、路障、除胎器、自动旗杆、升降柱、自行车停车架

I'm looking for detailed information on the different options available for parking bollards. Specifically, I need to understand the materials, sizes, and designs offered, as well as any customization options that might be available. Additionally, could you provide insights on pricing, lead times, and any bulk order discounts? It would also be helpful to know about the installation requirements and any maintenance recommendations for the bollards you supply. Thanks!