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Simpson Strong-Tie Marine Screws are ideal for fiberglass, plywood and wood substitute materials when exposed to harsh marine or chemically caustic conditions. The extra sharp point aids in assembly operations. The specially engineered high-low thread cuts easily and quickly through dense materials. The specially designed teeth also “lock” them in place even with prolonged vibration in fiberglass and wood. Screws up to 1" are fully threaded. Screws over 1" are threaded 2/3 of the shank. Threads are .416" to .216". Made from 316 Stainless, packed 100 per box. Imported.