A 4 In 1 Counter Bore is a versatile cutting tool used in machining operations to create counterbore holes with different sizes or depths using a single tool. The "4-in-1" designation indicates that this tool can perform multiple functions or accommodate different sizes within a single tool body. They are often made from high-speed steel (HSS) or carbide for durability and heat resistance, ensuring longevity and consistent performance in various machining environments. 4 In 1 Counter Bore is a versatile cutting tool designed to create counterbored holes of various sizes and depths using interchangeable components.