Bike Mount, Treadmill Mount, Exercise Bike Cradle Mount Holder for Kindle Fire HD 7/8.9/10 Inch w/Anti-Vibration ZipGrip Mechanism (use with or without case) Quick release strap allows fast / easy attachment and removal of the mount Adjustable swivel ball head mounting connection for maximum flexibility For bikes, treadmills, ATVs, anything with cylindrical bars posts or frames (15mm to 50mm) Digital`s Zip-Grip is designed to hold your Kindle Fire HD 7 / 8.9 Inch with or without a carrying case Adjustable legs keep buttons and ports free