Sidewinder Grip Twister &mdash; Wrist, Finger, Fat Grip Exerciser, Adjustable Resistance &hellip; Blow up and strengthen your wrists, fingers and thumbs  and the forearms along the way Fat Grip Training with 4.25 inch diameter handles which forces more of your muscles to fire up and grow Adjustable tension from zero to impossible. More convenient than using a forearm roller with weight plates. Grip ready knurling on both handles and inside knurling on the left handle for special pinch exercises