3/8" x 16 tpi Threaded Insert for Bottle Stopper Chuck

Making bottle stopper tops has never been easier. Simply drill a 1/2 in. pilot hole into your blank, glue in the insert and you're ready to mount your blank to the bottle stopper chuck and turn. Works with any material that can be machined. Allows you to easily assemble and disassemble your blank from the kit. You can also use it as a Screw Chuck system where you use the insert in the blanks and the Bottle Stopper mandrel as a screw chuck.