Fit for boat,sailboat yachts,car and trailer railings, ship railing base --Max. Screw hole size 5.5mm/0.21” --All Boat Rail Fitting Size: 66*66*45 mm / 2.59*2.59*1.77 inches --Metal wall thickness 3mm/0.11 inch Package list : 1 x 90 Degree Round Base Hand Rail Fitting 3 x Screws 1x The L shape hex key