This model is used to mount items to you Alumacraft gunwale, instead of buying other mounts. These are also non-maring and wont damage the boat! Printing with 0.20mm layer height, 6 walls, 4 top/bottom layers and a 25% rectilinear infill. These parts are very strong and wont take long to print. They are designed to use ¼-20 UNC hex nuts, and a 2-½" hex head cap screw for clamping.