Grip-Rite PrimeGuard Plus exterior screws are used for exterior projects like decks or fences and used in wood to wood applications. They can be used for all exterior projects where rust protective coating is necessary. Type 17 point reduces need to pre-drill and prevents wood-splitting Six-sided star drive provides quick bit engagement and greater torque control than other drive designs ackage quantity approximately 87 pieces Ideal for all exterior material applications