Shorter, more curved and slightly broader blade than Barnhart 5-6 It adapts to concavities of roots in shallow pockets. Rounded toe removes lingual anterior stains. Columbia curettes have universal blades cutting edges on both sides of the blade and a rounded toe Columbia 13/14 Curette is Shorter, more curved and slightly broader blade than Barnhart 5-6. It adapts to concavities of roots in shallow pockets. Rounded toe removes lingual anterior stains.