Blades are constructed of Electro-Polished 12-gauge (2.7 mm) laser cut 304stainless steel with 1" (2.5 cm) turned up edges and a 5 degree taper on theinside, heavy duty hinge with 1/4" (6.4 mm) diameter hinge pin. Full transomback plate with welded on stainless steel upper & adjustable lower actuatormounting brackets, 5/16" (.8 cm) stainless steel mounting bolts & mechanicalstrain-relief cable seals. 3.75" (9.5 cm) sacrificial anodes installed.