Pack of 500 fine thread square drive self-tapping wood screws used with Pocket Hole Jigs for secure jointing in hardwoods and dense sheet materials. These 30mm long No7 gauge screws have a self-tapping cutting point for pulling up joints tightly without splitting. They are high quality fixings ideally suited for use with materials from 12 to 19mm thick. Made from steel for strength with a zinc coating for durability and longevity, preventing rust issues if moisture is encountered. The large dome head with a washer shoulder provides maximum tightening torque.