This handle plugs into your colwood woodburning unit. A replaceable tip can then be placed in the handle, heated and you are ready to do some woodburning. You can use one replaceable handle with as many woodburning tips as you like. Better yet, keep a spare on hand so one tip can cool while you are working with the next. A useful accessory is our tip puller CE-0155. Makes pulling the tips out a breeze.