Does anyone know what this is?

[ezypikns]

My Daughter-in-Law's Dad passed away a couple of years ago and she found this in a box that he left behind. My first thought is that it might be some sort of gunsmithing tool as he was a very active hunter and fisherman. That may be WAY off, though.

[Joe H]

It's to hold a rope tight I believe

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[PeePaw on Fork]

Fishing rod holder

[WRasco]

It is a cam cleat used in/on sail boats. Guess it could have other uses anywhere you need to keep a line tight.

[Shane]

Yep, or used to hold an anchor rope.

[AntlerCollector]

That was an easy one.

[Paycheck]

Wrasco is correct. Cam Cleat.

[coachwhip]

They work pretty dang good for fastening climbing sticks to boot!

[BTLowry]

Yep cam cleat, most notably for hunters, found on muddy climbing sticks