Berntsen 2" Aluminum Concrete Survey Marker

The "CD" style aluminum concrete marker has a ¾" (19mm) diameter x 2" (50mm) long stem and is notched to hold firmly in concrete or rock. It is available in 2" (50mm) diameter and one-piece orbital formed from solid 6000 series aluminum.
The
CAPMAG ceramic magnet can be used with these concrete markers to assure easy detection of the mark with a magnetic locator up to four feet deep.
The
CD2DRL countersink drill bit is made specifically to perfectly recess this CD2 concrete marker in existing concrete.
CD2 Concrete Marker Installation Instructions 
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Preview
A = 2" (51 mm)
B = 2 1/4" (57 mm)
C = 3/4" (19 mm)
Countersink Drill Bit Video for Berntsen Concrete Markers