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
Embedded anchors such as anchor piles (driven or drilled) are required for situations in which a large holding capacity is required. The design of anchor piles allows for three types of mooring configurations, vertical tethers, andcatenary and semi-taut/taut moorings, which allows for the mooring of different types of offshore structures, such as offshore wind turbines, FPSO, FLNG, etc. An industry example is the Ursa TLP which has been held on-station by 16 anchor piles of 2.4 m in diameter at 147 m long, weighing 380 tonnes each.