Review on Magnetic Cup Holder Phone Mount with Extendable Arm - WixGear Universal Car Cup Holder Cradle for Smartphones with Adjustable Base - Automobile Cup Holder Car Mount by Jeremy May

Very easy to apply and holds the drink holder very well. The stability of the retractable arm is the only real gripe I have. The lock nut is too soft. It works well if your phone isn't heavy (or case plus phone). So far it's coping with my a51 and its body but that's all. If the mother holding the arm loosens up over time, I imagine it's going to be a headache (haha). I almost gave it a 3 rating, so maybe 3 1/2. Update - The "soft" nut came loose after about 3 weeks. Fortunately, the nut is a standard size, so it can be replaced. Back to 3.