Natural bone screws or tenons for pipe stems.  Various sized and styles available.  These are unused (NOS) New old stock!   They were purchased from a local tobacco shop along with other pipe making supplies and equipment and these are no longer being produced.  Price includes shipping

*Note dimensions are approximate.  Each piece is slightly different as they were all hand made.  I've taken the best measurements on what I considered to be nominal pieces.  *TPI (Threads per Inch) is my best estimate based off rough measurements.