3CHExplorer Double End, round stainless steel handle. FUNCTION: To examine tooth surfaces for caries, calculus, or defects using the sense of touch (tactile) FEATURES: Thin, sharp working end comes in different designs Common styles are the #1, 2 (pigtail), 3DE, 3CH Cowhorn, 11/12 Gracey, 17 Explorer, and 23 (Shepard's hook) Maybe Single or double-Ended (different design on each side) TRAY SET-UP: Exam and Basic Set-up, a component of most procedural tray set-ups. CLINICAL APPLICATION: Also used to: Check the fit of margins of restorations Evaluate root surfaces and furcation area in the periodontal exam (11/12) Remove excess material from restoration or preparation, Remove excess cement.