For adding more rod holding capacity. ROD-UP Tip Holder Sub-Assembly includes (1) RP8 Horizontal Head Rest Tip Holder, (1) RP7 Half-Wrap Tee, (2) RP23 Plastic Head Thumbscrews, (1) RP4 Dovetail Tube for Vertical Tip Holder (15"), (1) RP3 Adapter for Tip Holder Vertical Tube and Foam, (1) RP2 Tip Holder Foam Channel and (1) RP32 Large Tip Holder Foam.