约旦采购需求：井盖、井踏、井盖表面、沟箅、圆形井盖、方形井盖

I'm currently looking to source manhole covers for an upcoming project. Could you please provide detailed specifications, including material, size, load ratings, and any applicable standards? Additionally, I would appreciate your pricing information, including bulk order discounts and lead times for delivery. If there are any available options or variations, feel free to include those as well. Thanks!