These Metric Flare Nut Spanners (6-24mm) are designed for use with compression nuts on hydraulic lines, diesel and petrol injectors, gas and refrigeration systems. The flared design enables you to overcome the line where a traditional spanner would fail. The spanner has a greater surface area once in situ. Manufactured from chrome vanadium, heat-treated and nickel-plated for increased durability. These are the 6 Point Type and in my experience work better than 12 point type on corroded unions/nuts. 6 Double ended Spanners in sizes (Metric mm): 6X8, 10X12, 13X14, 15X17, 19X21 & 22X24mm. Manufactured from chrome vanadium. Heat treated and nickel plated for increased durability. For use with compression nuts on hydraulic lines.