The New Thorsen Twist Grip Spline Dog bone set is a high-quality mechanics automotive tool that is designed for precision and ease of use. This set includes various dog bone splines in different sizes, making it versatile for a wide range of automotive applications. The Thorsen brand is known for its durable and reliable tools, and this set is no exception. Made in China, this set is a must-have for any mechanic looking to add to their collection of useful tools.