The GT2 model has an open finger layout for an open and comfortable fit. It is highly recommended to use the grip with a basic silicon case to ensure a strong hold. You can also purchase small rubber bands to help hold the device in place (not included).

Grip Size: H20: Finger holes: two 20mm and one 19mm finger hole. For a loose fit, the H21 is recommended

Clip Top Size: T115: Small Tablet/eReader: fits devices 179–200mm tall

More information is available at https://gripatech.com/ Assembly video: https://youtu.be/fU-zGeis-mA