• Tip for desoldering iron The Inside Diameter (I.D.) of the tip must be large enough to fit over the lead, while providing sufficient room so that air and solder can be drawn through the tip The Outside Diameter (O.D.) of the tip must be slightly smaller than the diameter of the pad to prevent tip contact to the board laminate and minimize the possibility of damage Dimension of 2.29mm (0.090") X OD: 5.1mm (0.200")

ThermoDrive tips are designed for effective removal of through-hole solder joints.
The ID of the tip should be slightly larger than the OD of the pin being desoldered.