Super Anchor D-ShakL Anchor* Unlike other anchors, our forged D ring is captured on the shackle with a spot welded plate. This keeps the D ring united with the anchor at all times, especially during installation in tough situations. * The anchor is only 4. 5 x 2. 0 and can be mounted on the exterior or interior of structures. * Installs onto wood framing, concrete and metal structures for a permanent or temporary application. * The D ShakL can be used in a horizontal lifeline