Lenco Electric Super Strong Trim Tab Kits were designed for sport-fishing boats, high speed cruising boats and large commercial vessels. 7 Gauge flat - 304 SS blades with all stainless steel mounting hardware withstand the rigors of the most demanding conditions. No spray or mist when mounted in recessed pockets. 3/8" diameter hinge pin and 3.75" sacrificial anode. All Super Strong Trim Tab Systems have Vandar Upper Mounting Brackets with Gland Seal and 10 gauge SS lower mounting brackets with 3/8" SS bolts.