At times, it may be necessary to give your blades additional cleaning. An easy-to-use blade assembly removal wrench, Retainer Nut Wrench. Turn the container upside down and grip firmly. Insert retainer nut wrench in groove of retainer nut and rotate counterclockwise to loosen. Then grip blades with a cloth and remove retainer nut by hand. Retainer Nut Wrench can be used for The Quiet One, Blending Station Advance, Drink Machine, Bar Boss Blenders, PBS Blending System, Vitamix XL and Vita Prep. - Plastic - Sold per each