The Double Gripper Phone Adapter by Novagrade provides a high quality digiscoping experience with added stability for use in harsh conditions. This adapter will is compatible with any round eyepiece between 39mm to 60.75mm but compression rings for eyepieces smaller than 39mm are also available by clicking here. The Standard Phone Adapter will fit phones and mini-tablets up to 4 3/8" wide with or without a protective case and can be easily adjusted.