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OSBM Bolt 
OSBM Bolt on concrete block at junction of fences, S side of road [3GL].
Location
Grid reference: SK 9417 1508.
Landranger 130: Grantham, Sleaford & Bourne.
Structure: Concrete block.
Waypoint: OS0687.
Neighbouring Flush Brackets
The nearest fundamental bench mark is Waltham-on-the-Wolds,
16.64km to the northwest.
Third Geodetic Levelling, England & Wales (1950-68)
This bench mark was used during the Third geodetic levelling, England & Wales. It was included on the Castor to Waltham on the Wolds levelling line. The surveyor's description was OSBM Bolt on concrete block at junction of fences, S side of road.
Location
Grid reference: SK 9417 1508.
Landranger 130: Grantham, Sleaford & Bourne.
Structure: Concrete block.
Waypoint: OS0687.
Neighbouring Flush Brackets
| 1229 | New Inn Farmhouse 724.50m to the east. |
| 1230 | Greetham, Wheatsheaf Inn 1.38km to the southwest. |
| 1231 | Greetham: 16 Great Lane 1.48km to the west. |
| 1228 | Horn Lane Spinney 2.47km to the southeast. |
| 1232 | Heath Lodge 2.68km 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 Castor to Waltham on the Wolds levelling line. The surveyor's description was OSBM Bolt on concrete block at junction of fences, S side of road.
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