Built-in millimeter gauge measures files and positions rubber stopper Right or left hand use Small and large rings are included to accommodate most finger sizes Flat bottom enables the Endo Assist to stand freely on its own Comes with 12 disposable foam inserts Foam cleans and holds files Designed to slide into side of the Endo Guards Dimensions: 1-1/2" x 1-3/4" x 1-5/8" Autoclavable up to 136°C/275°F Washer-disinfect Contains Antimicrobial Protection