Bottle Stopper Chuck - 1"x8tpi headstock mount - 3/8"x16tpi stud - shoulder 13/16" - Import

Saves time and holds stopper blanks securely. . Chuck's threaded insert matches the components of most of our bottle stopper kits. Will not work with Teardrop bottle stopper #1540 Threading wood into a wood or acrylic hole is not an exact science; you may find the mandrel a bit too loose or too tight depending on many factors including; your drill press accuracy, type of material, moisture content etc. Although the bit works fine in most cases we cannot guarantee it works in all cases. These had been shipped with a 23/64" bit (but Not any longer) in the past but we have found that using a 5/16" drill bit tapping works much better. Thus, we have quit sending the 21/64 drill bit with it. We suggest that you order or get a 5/16" drill bit. Threads onto any 1"x8tpi lathe