XD Center Rigger Top MountFor use on sport fishing boats up to 40 feet.Features:Accepts all Tigress XD 1-1/8" butt diameter center riggers19 upper-arm angle/locking (@10 deg.) using Tigress XD 316 Stainless Steel tooth locking design with horizontal stopsLarge 'XD' Aluminum 12mm thick base plate with four corner mountingExtreme-duty 316 Stainless Steel and anodized aluminum constructionAmbidextrous mounting option to accommodate the side the tri-lobe knob is positioned onLarge 3-lobe UV ergonomic knob for changing and locking the outriggers' elevationStandard A 1/4" diameter stainless steel locking push-in-pin for outriggersA 1/4" through x 4.050" x 2.625" 4-bolt pattern3-Year Limited Warranty