Constructed from CNC alunimun ball (Dia. 17mm) with 1/4"-20 male thread, this adapter is designed for MagSafe Wireless Charger Holder to be connected with any equipment comes with a 1/4"-20 female thread. Ideal to be in conjunction with Super knuckle system with KS-403 which is ball head with 1/4"-20 female thread. Features two milling flats that allows you to tighen/ loosen the adapter effortlessly with tool. This 17mm ball adapter is also compatitable with those motorcycle mounting systemth for the recognized brands in the market.