Train yourself up to the majors with this dilator kit. This kit allows you to start off small and at your own pace step up to a bigger size. Once you get to the last plug, you will be ready to take anything that comes your way. Measurements Length range of 3.25 to 5 inches and diameters of 1 inch, 1.25 inch, 1.5 inch, 1.75 inch and 2 inch.