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The Simpson 316 Stainles Steel Philips Drive Pan Head Marine Screws are designed to fasten securely in fiberglass, plywood and wood-substitute materials in applications exposed to harsh marine or many chemically caustic conditions; ideal for applying trim, rub rail and molding to fiberglass boat hulls. Specially engineered, high/low thread form incorporates indentations (“teeth”) that cut easily and quickly through high-density materials. Extra-sharp points speed Screws starts during assembly. Back-out resistance: once driven home, “teeth” lock the fastener into place (the thread indentations will resist back-out even after prolonged vibration).