This chest strap mount for cellphone width between 55-85 mm like: New Model iPhone 17 16 15 14 13 12 11 Plus Pro Max,iPhone X XS XR Pro Max 8 7 6 / Samsung Galaxy S21 S21+ S20 S20+ S10 S10+ S9 S8 S7 S6 Samsung Galaxy Note 20 10 9 8 Adjustable cellphone chest strap will fit most chest size. Made of high quality elastic nylon and ABS buckle, adjustable and durable. J hook mount, long screw, adapter and phone holder included.Light weight, portable, easy to take. Now you can record what you see on your trip or when you are riding a bicycle by using your phone from the point of view of your chest. No need to buy other action cam. Not recommend for high impact sports. Please make sure that your phone is securely mounted in the phone holder before you go. All needed accessories are included. Just screw them together and put your cellphone between the adjustable phone holder and enjoy your cellphone video record. Package Include: 1x chest strap mount harness ,1x J hook mount ,1x adapter ,1x long screw ,1x phone holder