CHRS covers and frames are made of composite material of fiberglass and special resin that is moulded at high temperature and high pressure with the standard of EN124:1994. Features Manufactured to BS: EN124 Class D400&C250 Skid resistance 900mm (35.4”) Clear opening Lockable with screws Sealed with rubber Manhole lid lifter :ID2242/ID692 Color available as black, grey , green, yellow and others Clients customized service