This is a Bergeon mainspring winder. I've been using it for 14 years. ◯ Holder for right-handed winding ◯ Dummy barrel #4 ◯ Dummy barrel #7 ◯ Winding arbor: Red, #2, Rolex 21 series ◯ Winding arbor: Red, #4, Rolex 31 series ◯ Winding arbor: Red, #6, Rolex 15 series ◯ Winding arbor: Blue, #2, Rolex 22 series ◯ Winding arbor: Blue, #7, Rolex 40 series * Red is for right-handed winding, blue is for left-handed winding ◯ 2 spacers ◯ 2 covers to hold the mainspring when removing the winding arbor I rarely used the holder. There are spacers for use with the combination of dummy barrel #4 and winding arbor #2 (to prevent wobbling during winding). There are also spacers for use with the combination of dummy barrel #7 and winding arbor #4. There are also covers to prevent the mainspring from exploding when removing the arbor. I modified the barrel cover to make them. The hooking points are also in good condition. It's made of brass, so it's discolored, but I will send it as is. Please understand that this is a used item before purchasing.