These are *very* sharp pin probes which attach onto standard 2mm test lead metal probe tips.  The attachment is a friction fit, without threading, so care is needed to prevent pulling the probe out of the TP88.  I use these tips with a set of TP175E probes, and they work great for hitting fine traces on circuit boards and for probing connector shells.  If your boards are conformal coated, this will go right through the coating to give a good reading.