to use a tool to hold a fish without getting one's fingers near the blade of the knife. Perhaps a tool like these could slip under a gill to hold a fish on a table to slice from the head toward the tail.
You're right about them being used on fish, although as I stated earlier it would be very hard to guess their exact purpose, unless maybe you were an unscrupulous fish salesman. They were actually used to make cuts in lean fish which would cause them to swell so they could sell for a higher price. More details and the rest of the answers can be seen here:
Good guess! .... Or a tool related to making the fishing net (gill net). A tool to help tie a knot in the net and/or the wedge piece helps guage/measure the size of some aspect of the netting's holes.
Sonny
It's to push down really hard to get a good bond between the tire and the patch.
Cheers! Rich
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