Zipp Service Course Bolt Kit Genuine Zipp Components Whether you need nuts, bolts, or washers, you'll want to get the right parts for the components you have. The Zipp Service Course Bolt Kit is designed for Zipp Service Course Stems. It comes with 6 bolts that you can use for your Zipp stem. Features Comes with 6 bolts for your stem Designed for Zipp Service Course stems Manufacturer's part number: 11. 6518. 007. 000 | Zipp | Service Course Bolt Kit Steel Black