Our custom Square Manhole covers are being built to meet all sizes and configurations to cater to your bespoke requirements as well as in accordance with A15 to D400 standards. Jinmeng manufactured from an exclusive composite formulation of polyester resin, fiberglass, and calcium carbonate yields lightweight high strength manhole covers. This proprietary composite handhole is stronger and much lighter than concrete, Fits with any environment, and is corrosion-free. One person can be easy to handle which saves both time and money during operation, installation, and transportation. There is non-scrap value on them and it is hard to get the attention of thieves.