This 2-1/2-inch coarse thread, #2 square drive washer-head screw works well in 1-1/2-inch thick material. The washer head of this screw is our most popular head style as the wide bearing surface of the head will not overdrive in the bottom of the pocket. This is especially important in softer materials like plywood and composite. The screw also features a type-17 auger tip that self-taps its own hole, eliminating the need to pre-drill, in even the hardest materials. Kreg screws also have larger-diameter steel shanks than many other screws on the market today, making for an impressively strong screw that is almost impossible to break. Our screws have a bronze-colored finish and a dry-lubricant coating that eases driving torque and provides greater rust resistance. For maximum rust resistance, look to our Sun-Seal coated weather resistant screws.