The RAP-114-P4U consists of a 4" long spline post, ratchet connector with male teeth and knob. The ratcheting feature allows for the connecting rod holder to tilt forward and back for optimum angles. Compatible with an assortment of RAM spline post bases, the RAP-114-P4U can quickly be removed and repositioned. Spline Post: 4" Compatible Mounts/Holders: 1. Attaches to all RAM rod/tube holders with female groove pattern. 2. Attached to all RAM spline post bases.