1CTX154 T-30#15 x 4" Construction Lag Knurled Shank Type-17, Bronze, (100per Pack)$$Hardware

Heat treated & hardened, these screws are stronger & more durable than ordinary lag screws A built-on round washer head with smooth edges gives a professional finish 1200-Hour corrosion resistance in both ACQ and salt spray conditions Deep, wide, sharp threads provide maximum holding power; cut cleanly and easily Drive: T-30; #15 x 4"