Hakko N61 nozzles are compatible with the FR-301 desoldering tool, as well as the FR-4101/4102 handpiece. The following is an overview of each. Please see the documents section on this page for a complete set of dimensional drawings. N61-01 - 0.6mm, Thin Pad N61-02 - 0.8mm, Thin Pad N61-03 - 1.0mm, Thin Pad N61-04 - 0.8mm Extended N61-05 - 1.0mm Extended N61-06 - 1.3mm Extended N61-07 - 0.8mm N61-08 - 1.0mm N61-09 - 1.3mm N61-10 - 1.6mm N61-11 - 0.8mm Extra Long N61-12 - 1.0mm Extra Long N61-13 - 1.3mm Extra Long N61-14 - 1.6 Extra Long N61-15 - 3 x 1.0mm N61-16 - 4 x 1.0mm N61-17 - 2.3mm