This is the Oneway interchangeable handle, approximately 12" in length. It is made of a durable steel core covered by a hard plastic with nylon strands woven in the plastic. At one end is a 5/8" opening and the other end has a 1/2" opening.
This is a great option for 1/2" and 5/8" round shank tools (usually bowl and detail gouges) and some flat shank tools. The tool is held by two set screws, Allen wrench included.
Note: A 3/8" adapter is available for $12. Please email Alan to obtain this adapter. firstname.lastname@example.org