This is a set of 9 Wristwatch and Bracelet Wristwatch mainspring winders. The knurled winding sections have 2 ends one for clockwise winding. The other side is used for counterclockwise winding of the mainsprings. All "NIBS" or "TITS that grab the mainspring for winding are in good shape on all winders. The inside diameter of the winders are as follows: 9.87mm,9.25mm,8.62mm,7.97mm,7.45mm,6.67mm,6.09mm,5.37mm, and 4.80mm (measured with a digital vernier caliper). These are in great shape and color coded and in almost new condition. Thanks for looking, Happy to answer any questions. Check out my feedback