Big Timber SCTX Type 316 Stainless Steel Construction Screws are the superior alternative to traditional Lag screws. Features such as sharp deep-cutting threads and a knurled shank allow for quick, easy driving into wood and a notched Type 17 point allows for quick starting and prevents the screw from "walking". The large diameter Round Washer head with a 6-Point Star (Torx) Drive allows for easy high-torque installation and reduces drive bit slippage. Manufactured in accordance with ASTM B117 and ASTM G85 standards for corrosion resistance in exterior applications. The Type 316 Stainless Steel Big Timber SCTX series screws are ideal for marine applications, all chemically treated materials, plywood, and all wood applications which are exposed to weather, high moisture, and caustic conditions.