What is the primary purpose of the top cap on a stepladder?

The primary purpose of the top cap on a stepladder is to hold tools or materials. This feature enhances the efficiency of the user by providing a convenient place to store tools or other items while working from the ladder. By having a designated spot for tools, the user can maintain focus and avoid unnecessary trips up and down the ladder, thereby improving safety and productivity.

While the other options mention various functionalities—supporting the ladder, acting as a grip, and increasing height—the design of the top cap is specifically aimed at facilitating workspace organization. In practice, this helps minimize distractions and enhances the overall safety of the ladder use, as it encourages users to keep their hands free for handling other tasks.