Berntsen 3.5" Aluminum Concrete Survey Marker
Berntsen "C" style aluminum concrete markers (US Army Corps of Engineers Type 1 Disc) has the classic 3" (76mm) long split-style tapered stem with inverted "Y" design for anchoring into concrete and rock. It is available in 3½" (81mm) 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.
C35D Concrete Marker Installation Instructions 
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Preview
A = 3 1/2" (89 mm)
B = 23/32" (18 mm)
C = 3 5/16" (84 mm)
D = 7/8" (22 mm)
Countersink Drill Bit Video for Berntsen Concrete Markers