Two Backing Plates for Andersen 40 winches, self-tailing or non self tailing. Custom made of marine grade aluminum, 3/16” thick. 100 mm bolt circle, 152 mm overall diameter. Way better than using fender washers!! As new. Plate dimensions found here: https://drive.google.com/file/d/0B5-g_RY2uN1Fb1JURVRJelB6U28/view?resourcekey=0-HG8ArzgTtFAqOqiklO0kMg