These Nicopress copper micro ferrules are designed to secure loops in our stainless steel micro cables. These ferrules should all be used in conjunction with the Nicopress Micro Small Wire Tool Type 17-BA and Tool Type 17-B4B Number of compressions is as follows: 0.26 mm requires 3 presses 0.51 mm requires 3 presses 0.75-0.9 mm requires 2 presses Tests show that the terminations exceed the strength of the wire.