These mounts use an adjustable strap to attach to any part of a treadmill that is up to 1.75 inches in diameter.  The cradle is well made and expandable to fit models using a case such as an Otterbox.  The adjustable tablet holder fits any tablet 7" - 12" diagonal screen size with or without a case or skin.  Swivel ball connection for 360° rotation with tilt for portrait or landscape viewing. The cradle opens to 9.25 inches.  On larger tablets like the iPad and Motorola Xoom, the supports fit around the sides and can be oriented into landscape using the swivel feature of the mounts.

Fits many models including:

Acer Iconia A100

aPad

Apple:  iPad, iPad2, iPad 3 (The New iPad), iPad Mini

Acer Iconia A500

Amazon Kindle Fire

AOC Breeze

Archos: 101, 70

Asus EEE Pad Transformer, Transformer Prime

BlackBerry PlayBook

eLocity A7

Google Nexus 10

HP: Slate, TouchPad

HTC Jetstream

Lenovo IdeaPad

LG G-Slate

Motorola Xoom and Xoom 2

Nextbook: Next2, Next3, Next5, Next6, Premium7, Premium8, Premium8se, Premium9

Samsung Galaxy Tab, Samsung Galaxy Tab 2 7.0, Galaxy Tab 7.0 Plus, Galaxy Tab 7.7, Galaxy Tab 10.1, Galaxy Tab 2 10.1, Galaxy Tab 8.9, Series 7 Slate, Note 10.1

Sony Tablet S

SuperPad

Toshiba Thrive

Velocity Cruz T301

ViewSonic: gTablet, ViewPad 10, ViewPad 7

Vizio 8