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OSBM Bolt 
OSBM Bolt on brick surround of manhole, 4' E of hedge junction, 5' S from hedge, N side of road [3GL]; OSBM Bolt, manhole, 1.2m E of hedge junction, 1.5m S of hedge, N side of road - presumably intended as replacement for FB 928 nearby.
Location
Grid reference: SN 8892 2948.
Landranger 160: Brecon Beacons.
Structure: Concrete block.
Waypoint: OS0544.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Llandovery,
11.86km to the west.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Brecon to Llandovery levelling line. The surveyor's description was OSBM Bolt on brick surround of manhole, 4' E of hedge junction, 5' S from hedge, N side of road.
Location
Grid reference: SN 8892 2948.
Landranger 160: Brecon Beacons.
Structure: Concrete block.
Waypoint: OS0544.
Neighbouring Flush Brackets
| 928 | Mynydd-bychan Cottage 50.99m to the west. |
| 927 | Graiggoch Farm 1.05km to the east. |
| 929 | Trecastle, School 1.06km to the west. |
| 930 | Llywel, Bridge 2.00km to the west. |
| 925 | Ynys-yr-wyddfa 2.39km to the east. |
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Brecon to Llandovery levelling line. The surveyor's description was OSBM Bolt on brick surround of manhole, 4' E of hedge junction, 5' S from hedge, N side of road.
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