孟加拉采购需求：金属服务器机架网络机柜，壁挂式机柜

I'm looking for pricing details for two specific rack types, ideally the ones with a depth of 450mm and a height of 4U and 6U. It would be great if you could provide a detailed quotation including any bulk order discounts or lead times for delivery. Additionally, I'd appreciate it if you could include specifications for these racks, such as weight capacity and material used, as these factors are important for our decision-making. Looking forward to your prompt response with the requested information!