The Carbide Tipped Rotary Hammer Spline Drive Core Bit is a high-quality drill bit designed for spline drills. Made of durable steel and weighing 10 pounds, this 4 1/4" diameter bit is 19" in length. Manufactured in the United States, this unit is ideal for various drilling applications, making it a valuable addition to any workshop or tool collection. With its spline drive design, this core bit ensures a secure and efficient drilling experience.