I think anyone who searched this part knows what it is and how to use it. ;) It's for a very special constellation I have in my personal setup. If there are any questions about anything - feel free to ask. These are the parts for what this adapter was designed for: Propeller http://www.graupner.de/en/products/0e83a7f8-937c-4999-aa76-dda2618f2c65/1326.11X5/product.aspx others might have the same diameter (8mm) so as long they have the same hight any other propeller should be compatible. The following drives should be compatible: https://www.mikrocontroller.com/index.php?main_page=product_info&cPath=75&products_id=465 https://www.mikrocontroller.com/index.php?main_page=product_info&cPath=75&products_id=466 https://www.mikrocontroller.com/index.php?main_page=product_info&cPath=75&products_id=556