Designed to tighten collars over flared pipes like brake lines, you can use them for any standard hex head. They spread the load onto more than a standard spanner, decreasing the risk of rounding the shoulders of the head.

Draper 6 Piece Flare Nut Spanner Set | Combination Spanners Set 6-22mm | Spanner Roll | 17759
5.0

AB Tools Metric 6 Point Flare Nut Pipe Wrench Diesel Injectors Spanners 6mm - 24mm 6pc
4.0