Which part of a tool can accommodate different attachments?

The correct answer is the collet. A collet is a specialized component of certain tools that is designed to securely hold and align various attachments or bits. Its principal function is to provide a strong grip on these components while allowing them to be easily interchanged. This feature enables versatility in the tool's applications, as users can quickly switch between different attachments to suit their specific needs, whether for drilling, sanding, or another operation.

The other parts mentioned do have specific roles but do not serve primarily for accommodating attachments. The handle is designed for user operation and support, while the base typically provides stability for the tool. The grip is focused on comfort and control during use but does not facilitate the attachment of different components.