#305 Stainless steel star ( Torx) head with nibs, coarse thread, type-17. Highest degree of corosion resistance. Application: Exterior wood screws for outdoor applications. Attaches wood to wood. Installation: A standard screw gun with torque limiting nose piece set at a maximum of 3000 RPM drive speed recommended. Use a T-25 Star drive bit. Do not over torque as it can cause the head to snap or damage to the work surface. Specifications: • Superior penetration through a variety of woods • Star drive prevents cam out and stripping for improved driveability • Type ‘17’ reduces wood splitting and eliminates the need for pre-drilling • Nibs under head provide flush finish • High degree of corrosion resistance