1、Wheels are made of metal and will not be cut or damaged by the frame wire. 2、Placed on the completed wire, grip tight, then pull along the wire, it will crimp the wire and tighten in one movement. 3、Retractor tool is designed for those who are still using the traditional manual way of pulling people silk nest box design. 4、Used to provide tension to lose frame wire. 5、Using this tool, the wire or stainless steel wire is fixed to the nest box.