What are the three heads found on a combination set?

A combination set is a versatile tool utilized primarily in woodworking and metalworking, and it is designed to handle various measuring and marking tasks. The three heads typically found on a combination set are indeed the square head, the center head, and the protractor head.

The square head is essential for making right-angle measurements and laying out 90-degree angles. It is widely used for ensuring that cuts and joints are accurate, making it indispensable in both woodworking and metalworking.

The center head is specifically designed for finding the center of round stock. This is particularly useful when machining cylindrical objects or when precise drilling is required. It aids in achieving symmetry and balance in the workpiece, enhancing the quality of the finished product.

The protractor head allows users to measure and lay out angles. This head is critical for tasks that require angular measurements, enabling accurate settings for machining operations or layout work that involves angles beyond the simple right angle.

Since each of these heads serves a distinct purpose, and collectively they enhance the functionality of the combination set, which allows users to perform a range of tasks effectively, the answer encompasses all three components. This makes the choice of selecting all options as the correct answer appropriate, affirming that a complete combination set indeed includes the square head,