Free size For right and left hands Thumb joint fixation support Strong thumb belt supporter Supporter to firmly rest the thumb Employs three fastener belts Adjustable to your size For tenosynovitis, trigger finger, arthritis, thumb CM joint disease, etc. Width: Approximately 17 cm, Height: Approximately 19.5 cm Width at the finger: Approximately 5.5 cm Built-in fixation plate Washable (remove the metal plate) I didn't use it except for trying it on because the size didn't fit.