These professional-grade GRK R4 multi-purpose screws are designed for high-performance framing and decking applications. Featuring a 10-gauge diameter and 3-1/8 inch length, the fasteners include a Star Drive (Torx) head to eliminate stripping and a countersinking bugle head with cutting teeth for a flush finish. The patented Zip-Tip and W-Cut thread design allow for fast starts and lower driving torque without the need for pre-drilling. Built with a Climatek coating for superior corrosion resistance, these brass-colored carbon steel screws are ICC-ES ESR-3201 approved for use in both interior and exterior projects, including pressure-treated lumber. This Extended Contractor Pack (Model 121370) contains 630 screws, ideal for large-scale remodeling, fencing, and structural framing