Endo Assist – Blue, Unique Organizer to Hold Entire Dental Procedure Armamentarium. For right or left hand use, Flat bottom, Can be Mounted on Endo Guard. Includes Small and Large Finger Ring, 12 Foam Inserts, Built-In Millimeter Gauge, Ruler. 1-1/2″ x 1-3/4″ x 1-5/8″.