What type of tool is essential for securing two wooden pieces at a right angle?

A carpenter's square is essential for securing two wooden pieces at a right angle because it is specifically designed to provide accurate 90-degree angles. This tool allows a carpenter or handyman to mark and measure wood accurately before making cuts or joining pieces, ensuring that they fit together firmly and correctly at right angles. The square's design, with one arm typically longer than the other, helps in aligning wood pieces properly for various projects, such as framing, cabinetry, and other woodworking applications.

Using a carpenter's square ensures the integrity and stability of the joint between the wooden pieces, making it a critical tool for any task that requires precision in corner connections. Other tools mentioned serve different specific functions, such as cutting or fastening, but they do not provide the same level of assurance for achieving right angles needed in certain constructions.