Highly Recommend: Mixer replacements parts is great rescue to anyone that was missing the hub cap and screw to their mixer Quick to Install: Our spring and washer are very easy to install and do not require disassembly, save time and money Helpful Replacement: There is also a steel bolt to secure cover cap or to secure the various attachments compatible with Kitchenaid motor socket Attachment Cap Hub and Fixing Attachment Thumb Knob Screw Stainless Steel Compatible with KitchenAid Mixers Parts Acessoriess