Berntsen 3½" Bronze Flat Concrete Marker
"C" style (US Army Corps of Engineers Type 1 Disc) has the classic 3" (76mm) long split-style tapered stem. It is available in 3-1/2" (89mm) or 4" (102mm) diameters. Orbital formed from solid unleaded silicon bronze bar.
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
C35FB Concrete Marker Installation Instructions 
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Preview
A = 3.5" (89 mm)
B = .72" (18 mm)
C = 3.3125" (84 mm)
D = .875" (22 mm)
(cap thickness = 3/16")
Countersink Drill Bit Video for Berntsen Concrete Markers