Sickle scalers, and universal and Gracey curettes share common components: handle, shank, working end and blade. The difference is at the very tip of the instrument (Figure 5). For all instruments, the instrument is held in the non-dominant hand using a palm grasp. The index finger and thumb should be near the junction of the functional shank and the top of the handle such that they will counter balance the force produced at the opposite end of the instrument once the stone is activated. For all stones, the lower half is held in the dominant hand with the thumb on the edge closer to the operator and the fingers on the edge farther. The entire arm will work in one fluid motion so the grasp is intended to stabilize the stone and make such a motion comfortable to accomplish. The difference between the instruments is found at the working end. These differences make sharpening technique a little different for each instrument type.