Columbia curettes have universal blades that have sharp cutting edges on both sides of the blade and a rounded toe. The terminal shank is 1.1 mm in diameter and 12 mm long with an elliptical blade shape that is 1.2 mm wide. Handle is Medium round. Handle: Standard Material: Signature Stainless Steel Free Sharpening: NO Brand: Classic Recently upgraded Standard handle has a moderate 5/16” (8mm) diameter with a segmented knurled grip to provide excellent control. The handle is 100% stainless steel and the finish is bright electro-polished to make it easy to clean and sterilize by any method. Made with signature stainless steel, the industry standard for over 50 years, to provide dependable and economical performance. Professional sharpening services are available for a nominal charge. Classic scalers and curettes are best suited for offices that already have established in-office sharpening procedures or clinicians looking to upgrade from their current heavy or plastic handles.