Lightweight and versatile, the Adjustable Rod Holder Mount for ShadeFin makes adding shade to your boat easy! Simply install by inserting the Adjustable Rod Holder Mount into a firmly welded T-top rod holder and secure in place using the nylon sleeve and Locking Knob. Easily adjust the angle of ShadeFin with the Sure-Grip knob. The Adjustable Rod Holder Mount fits any standard T-top rod holder, gunnel rod holder with an adapter or the Telescopic Rod Holder Accessory, sold separately.