... usage value, so its against theft.2. convenience and good appearance, the weight is only one third that of ... ’ market demands and also as a promise of our material quality, like the RoHS, UL, CCC, ISO9001, etc.3, ... &BMC products in our factories, such as manhole cover, electricity meter box, current breaker, water tank, bracket, helmet, etc. ... here. SMC BMC GRP FRP material manhole cover (good quality)