Toroid coil winding double hook is made from Teflon, Nylon and etc...It is one light And handy, high-strength, resilient tool. It is used for winding toroid coil. Make The wire be wraped tight with the toroid core. Avoid the magnetic wire of insulation Film be damaged. The single hook there are screw which need connect with the Handle to use(the handle is optional), or used in hook winding machine. The double Hook can be used to wind direct.