Dental Curette, Gracey, Rigid, Autoclavable Silicone Handle, GR 5-6Dental Curette, Gracey, Rigid, Silicone Handle, GR 5 6 Dental Curette, Gracey, Rigid, Ergonomic and Autoclavable Silicone Handle Instrument, GR 5 6. For Anterior and Premolar. American Type. The Rigid Curette has a stronger and less flexible shank than the standard one. It can be used effectively for heavy calculus removal without using additional scalers. Product Code: sCRGR5 6 or GR 5 6