The 4 Hole transom mounted gudgeon is one of the most common and used transom fittings around. The fitting has 4 5mm countersunk fixing holes for attaching to the back of the boat. This fitting is designed to be used with Sea Sure Transom Pintles. Packing pieces are available to increase the distance that the fitting sits off the back of the boat. The part number for this is 18.54
Hole Diameter : 8-10mm