Knot Cover (Calotte) 4mm Gold Plated. Calotte (knot cover) with open loop and hole for thread, in Gold plated metal. Diameter of cover 4mm. Here at Jillybeads we understand that some beaders can be a bit reluctant to buy online so if that’s you, give us a call as we are always more than willing to take your order over the phone, or even add an addition onto your existing order. We like to make your shopping experience as simple and easy as possible!