Bergeon No 5356 Assortments of winders for Nivaflex mainsprings and other qualities of steel Assortment of 17 mainspring winders for left hand and right hand mainsprings Contents: 17 mainspring winders for right hand No 00 - 15 and 1 handle. 17 arbors for left hand No 00 - 15 and 1 handle. In wooden case.