A new Carboloy CAT 40 fly cutter with 15 inserts is offered for sale.  The cutter takes a single insert and is unused.  There is no pull stud included.  The thread on the holder for the stud is 16mm with 2 mm pitch.  CAT 40 holders can have metric threads.  There are 10 CNMG543K inserts and 5 CNMG544P inserts.  The cutter is in the original box.