Description 2.0 Stopper : This is used to connect to the 2.0 initial drill of DIOnavi. Master to maintain constant depth during surgery. Range of length is 3~6mm with 1mm interval and anodizing and laser marking are done for each length. 3.0 Stopper : This is used by connecting to the ¨ª3.2 round drill of Flapless Crestal Sinus Kit. Range of length is 3~13mm with 1mm interval to maintain constant depth during surgery. Anodizing and laser marking are done for each length.