Berntsen offers the following styles of aluminum concrete survey markers for use in concrete or rock:

"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 6000 series aluminum bar.

For smaller marks use the "CD" style 2" (50mm) diameter marker has a 3 /4" (19mm) diameter x 2" (50mm) long stem and is notched to hold firmly in concrete or rock. Orbital formed from solid 6000 series aluminum bar. It is also available as a leveling mark with a raised datum point (with recessed center) for precise monitoring (model CD2L).

The "RT" style is a variation on the concrete disc theme and is available in a 3-1/2" (89mm) diameter. The RT1 offers more resistance to twisting and features four legs. Orbital formed from solid 6000 series aluminum bar.