MARINEMART HOT-DIPPED GALVANIZED BOAT STAND TOP ASSEMBLY – Our boat stand tops are hot dip galvanized in three separate pieces for maximum coverage. It features a precision acme threaded rod, providing increased adjustability under load. It’s plywood is pre-drilled and through-bolted, not screwed, so your stands spend more time on the yard and less in the shop. This unit is fastened together with 316L stainless steel bolts with nylon backing nuts, for strength and longevity. Overall length of screw is 26″.