No tip size in kit will fit M4. Don't buy for M4 inserts. A little short for working with the Hakko FX888D iron. The ones I got weren't as bad as the others but still useless without a pad for which I don't have a suitable jerry rig on hand. The two springs are identical and only suitable for M5 and higher due to the width of the spring. And the shoulder of the other tip is too narrow to sit flat on the M4. Maybe it's ok for M2.5 and M3 with spacer but only 1 out of 3 usable with modification is not enough to justify keeping the set, sending it back.
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