The VO threadless stem adapter allows you to use threadless stems on a bike designed for a quill stem. The advantages include the ability to use nowadays commonly available threadless stems with a variety of rise angles. Many threadless stems also have removable face plates, so bars need not be "stripped down" when switching bars or stems. Threadless stems can be "flipped" for additional rise or drop.
The VO stem adapter fits in a regular 22.2mm fork and works with a 1-1/8" (28.6mm) stem; 180mm total length, 110mm above the min. insert line, steel bolt and wedge. It accepts a standard 1-1/8", 40mm stack height stem. The finish is high polish alloy. 272g.