Flare Nut Spanners 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 steel heat treated and nickel plated for increased durability. 15 Degree Jaw. Package Contents: 8 x 9 10 x 11 12 x 13 14 x 15 16 x 17 18 x 19 22 x 24mm.