for MB15 Torch:Ø0.6mm or 0.8mm in fine M6 thread;
for MB25 Torch:Ø0.8mm, 1.0mm or 1.2mm in M6 thread;
for MB36 Torch:Ø0.8mm, 1.0mm, 1.2mm or 1.6 in M8 thread.