Berntsen Concrete Markers in aluminum or bronze are the equivalent of the Corps of Engineers Type 1 disc, and can be customized with your imprint. This orbital forged marker is made with a split-style flared solid stem and can be installed in wet concrete or drilled and epoxied into existing concrete. A magnet can also be attached to the underside of all our concrete markers which allows easy detection with a magnetic locator. Countersink drill bits to set our markers in flush with the concrete are also available.