Which type of fastening tool should be used on horizontal joints?

Using a pistol-grip tool for horizontal joints is appropriate because this type of fastening tool is designed for ease of use in various orientations, including horizontal positions. The pistol-grip design allows for better control and leverage, which is critical when working with fasteners in a horizontal orientation. This feature helps reduce user fatigue and improves the quality of the fastening process, making it easier to apply appropriate force without straining.

In contrast, while electric drills can also be used for fastening, they may not offer the same level of control as a pistol-grip tool, especially when working in tight spaces or at awkward angles. Open-end wrenches are typically used for turning nuts and bolts but do not provide the same kind of power or efficiency needed for fasteners in horizontal joints. Torque wrenches, on the other hand, are specialized for measuring the torque applied during fastening but do not have the ergonomic advantages that a pistol-grip tool provides for this type of joint.