8 x 1 Simpson Flat-Head Marine Screw - Phillips Drive 316 SS - Box (100) .
Marine screws bite and hold fast in fiberglass, plywood and wood substitute materials
Use for projects exposed to harsh marine or many chemically caustic conditions
Ideal for applying trim, rub rail and molding to fiberglass boat hulls
Extra-sharp points speed screw starts during assembly
Specially engineered, high/low thread form incorporates indentations ("teeth") that cut easily and quickly through high-density materials
Back-out resistance: once driven home, Marine screws are locked in place thanks to their "teeth" (the thread indentations will resist back-out even after prolonged vibration)
Holding power: Pull-out values of Marine screws exceed those of ordinary tapping screws in fiberglass and wood
Screws up to 1" in length are fully threaded.
Screws more than 1" long are threaded 2/3 of the shank length
