Nape piercing
Somewhat less common are surface anchors, commonly made from surgical implant-grade titanium. A surface anchor has two parts: a base or foot which is inserted under the dermis during the piercing process and which incorporates a stem exposed to the surface, and a decorative disc or ball of jewelry which typically appears flush with the surface of the skin. Surface anchor nape piercings are most commonly found placed symmetrically on either side of the spine at the nape.
Offshore embedded anchors
The increased cost of installing anchors in deep water has led to the inception of dynamically penetrating anchors that embed themselves into the seabed under free-fall. These anchors typically comprise of a thick-walled, steel, tubular shaft filled with scrap metal or concrete and fitted with a conical tip. Steel plates (flukes) are often attached to the shaft to improve its hydrodynamic stability and to provide additional frictional resistance against uplift.