This was in a pavement, and looks as if it might be a Post Office telephone cover. Two triangular metal pieces.
Silent Knight D400
Available in clear openings 1210×685 or 1825×685 and 100mm or 150mm frame depths, Silent Knight D400 offers consistent high performance in all conditions.
Silent Knight D400 is rated to EN124 Group 4 D400 load classification.
Recommended for use in trunk and city roads carrying continuous fast moving traffic.
Standards & Approvals
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Key Features & Benefits
- Double triangular Non-rock design
- Skid resistant radial chequer design
- Frame lifting points
- LTS installation and durability features
- Customer specific or generic badging available
- Anti-theft locking options
- A range of Safety Grids are available