Single hole hand touch:

 With round burners tips and single needle valves.
  Easy flameout and blackening when firing lead

Five  holes hand touch:

 With round burners tips and five needle valves
  Not easy flameout
  Splicing efficiency is high
  The tempreture of flame is high
  Can not blackening when firing lead glass tubing

Nine holes hand touch:

  With oblong “Fishtail” burners and nine needle valves
  Burning flame is sector and the area of heat is wide
  Can not blackening when burning lead glass tubing
  May be used for splicing max. diameter tube and electrode