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Famous Monuments

FENO Drive-in Spike Survey Marker

Berntsen FENO survey monument spike

The FENO Spike is available in three standard lengths: 350mm (13.77 inches), 600mm (23.62 inches), and 1000mm (39.37 inches)

The FENO anchored survey mark system offers a unique solution to surveyors who want to use a small, easy to drive quality galvanized steel survey mark. The unique FENO concept holds that in order to guarantee both the correct position and also the secure placement of marks, two conditions must be fulfilled: 

(1)   It should be possible to move a temporary mark into a permanent position. If the marker is fitted withfeno installation guide wings or lugs (or any other type of anchoring device) this is not possible. However, with the FENO system, the position of the marker can be easily changed at any time prior to the extension of the anchor prongs.

(2)   Once the marker has been finally positioned, it must be possible to lock the marker firmly and securely in the ground. With FENO markers, when the correct position has been achieved, the strong steel prongs can be extended to secure the marker into position, much like the roots of a tree.

 FENO Survey Monument Installation Instructions

Berntsen International, Inc.
  • 1-800-518-0934
  • All other countries:
  • +1-608-249-8549
  • PO Box 8670
  • Madison, WI 53708-8670
We accept VISA, Master Card, American Express and Discover Card.