OT Vertical is a cylindrical, friction-fit attachment suitable for partial dentures and bar connections. The castable plastic pin is used as a parallelogram key and, after casting, as a centering pin to connect and balance the prosthesis during insertion, particularly when there is no countersink.

Nylon male and female components are available in 5 mm lengths, but can be reduced to 3.5 mm without changing functionality. The reference of these two lengths facilitates replacement of the elastic clip (female) by the dentist.