Posterior Scalers are used to remove deposits from supragingival surfaces of posterior teeth. There are two basic design classifications for posterior scalers. They are Jacquette scalers (straight blade that tapers to a point) and sickle scalers (curved blade that tapers to a point). Mirror image blades on a long-reach terminal shank that is set at 30° to the handle. The blades have a reach of 5.5 mm and a width of 1.1 mm.