It allows the user to create a solid link which has the information of two points, two radii, one depth, and one normal direction. By defining the first point and the second point in order to define two points on the working window, the user can make it easily. For references, when selecting two points, the length is calculated automatically, and then the first radius is set as 10% of the length, the second radius is set as double of the first radius, the depth is set as a half of the first radius as default.
Figure 1 Link icon of the Marker and Geometry group in the Geometry tab [Body Edit Mode]