Product specifications: Cylindrical diameter 12mm hole size 8.1mm (with our 250W / 120W heating tube, dense thermal conductivity will not dry, to ensure that the heating core life) shovel width 16mm hole depth 33-35mm whole body copper Tempering welding word Po Note: tampon welding word when used to preheat, preheat to the vent hole after the smoke to welding, welding the location of the tip and the location of the welding must be sticky dilute hydrochloric acid or Tin solder solution, so that welding will be strong, high-power heating core is to ensure high temperature to ensure a solid welding, copper head must be copper, and only copper can hang tin can be welded, when the middle of the welding when the pause, Electric iron regulator down a little, so the temperature will not drop, it will not dry, to ensure that the life of soldering iron.