DSI Zenoss Bone Ring SetThis kit provides everything you need to install a bone ring. The set includes a bone ring, a holder, and drills for creating a perfectly accurate socket for the insertion of the bone ring. With this kit, you can easily and effectively install a bone ring without resorting to additional tools or searching for other solutions. If you need additional information on individual parts of the set please take a look here: Bone Ring Holder Trephine Drills