Hold fast

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For the root-like plant structure that anchors seaweed, see holdfast

A hold fast being used to affix a board to the benchtop for chiseling dovetails

A hold fast is an accessory used on a woodworking workbench to fix a workpiece to the top or side of the bench while it is being worked.

A hold fast is shaped like a shepherd's hook. In use, the shank fits into a hole in the top or side of the bench and the tip of the hook is pressed against the work. The hold fast is set by rapping the top with a mallet and is released by hitting the back side. A good holdfast works remarkably well, and is inexpensive and easy to install.