The GT1 model encircles your fingers completely for a 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).

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

Grip Size:

• H19: Finger holes: two 19mm and one 18mm finger hole. For a loose fit, the H20 is recommended
• H20: Finger holes: two 20mm and one 19mm finger hole. For a loose fit, the H21 is recommended
• H21: Finger holes: two 21mm and one 20mm finger hole

Clip Top Size:

• T048: Small Phone: fits devices 115–134mm tall
• T062: Medium Phone: fits devices 126–148mm tall
• T080: Large Phone: fits devices 144–166mm tall
• T115: Small Tablet/eReader: fits devices 179–200mm tall
• T160: Medium Tablet/eReader: fits devices 222–244mm tall
• T175: Large Tablet/eReader: fits devices 237–260mm tall