The Makita 3-1/2" Impact Gold Number 1 Phillips Double-Ended Power Bit (B-39609) is designed exclusively for use with high-torque impact drivers. Featuring high quality steel, this Impact Gold bit is engineered to last up to fifteen times longer than standard insert bits. A precision-fit tip prevents "cam-out" and stripping while the Xtreme Torsion technology allows the torsion section of the bit to flex under load for increased durability in high torque applications. It is ideal for driving screws in a wide variety of heavy-duty fastening applications including deck building, framing, and installing plywood subfloor. This is a dual-ended magnetic bit ideal for quick and efficient bit changes.