Normal bend for incisors and canines For the removal of sub-gingival calculus and for the root cleaning. Gracey curettes are the most popular and common, less traumatic than the Universal type. They are site specific as they are designed and assorted to adapt to the specific area or tooth surface to be treated. The blade of the Gracey curette is off set from the terminal shank at 70° and sharped only in one side. 3-4 Anteriors. Stainless steel handle diameter 8 mm. Having a longer shank, 3 mm longer than Gracey Standard, the long type Gracey is used for deep reaching into periodontal pockets.