Dave Bonta's "Handy" treats fear less like a monster and more like a tool you keep within reach. The speaker says their fear is "ready to hand and concise," as if it were a small, well-worn object always available. There's a dry, almost humorous tone in that idea: fear isn't overwhelming here, it's convenient.
The two comparisons stretch the idea in different directions. A stone carried while traveling suggests something solid, private, and comforting to hold, even though it's heavy. Then the poem shifts to "a castle of ink / for the best / pit I know." The image is harder to pin down, but it seems to link fear with writing: ink building a fortress, perhaps around or over a dark place. The "pit" may be a place of dread, and the speaker seems to know it well.
The mood is quiet, wry, and a little unsettling. Fear is familiar enough to be carried, shaped, and maybe turned into something made of words.