Obtain the perfect mandrel length for any pen kit. Just loosen the locking collar and adjust the mandrel as needed - no more hassling with spacers. Turn two barrels at once, or single barrels up to 6'' long. Consult your lathe's instruction manual to determine the appropriate MT (morse taper) size. 7mm shaft. This mandrel is also available with a #1 Morse Taper (44341, sold separately).