Mitred corners are one of the most difficult joints to clamp in all of woodworking. This very efficient Mitre clamp system is like no other clamping method. It draws the two Mitred pieces together and effectively holds them together with powerful spring-like rings. The rings have sharp points that do not drift or move once they are positioned. There are six ring sizes (A-F) for various sized workpieces. Ideal for picture frames, moulding, decorative trim and other Mitre-type assemblies. The rings must be installed with the special application tool. Both sets come with application tool, and eight each of all ring sizes. Made in Germany.