Description 25mm Deep Rubber Sealed Pressed Steel Manhole Cover & Polyproppylene Frame. Locked 4 Screws. Usage: Domestic Driveways & Application Areas with infrequent vehicle access. Pressed pattern lid 25mm deep frames produced Lids underbraced, where required, to meet required load rating Manufactured to standard sizes only to enable economic design Standard products produced are single seal non-lock and double seal locking Galvanised to BSEN ISO 1461 as standard 50 series 600 x 450mm clear opening covers in all loadings are available with single seal polypropylene frame