A variety of specifications allows you to choose the suitable wrench. Adopting full mirror polishing, the surface is not easy to rust. The wide range of applications allows this double open end wrench to be used in different work situations, which is very practical and useful. Made of carbon steel material, it is very durable to use. There are seven specifications compatible you to choose from: 1: 6 x 7mm, 2: 8 x 10mm, 3: 9 x 11mm, 4: 10 x 12mm, 5: 11 x 13mm, 6: 12 x 14mm, 7: 13 x 15mm. It is suitable compatible car repair, household electrician fitter repair, etc. Item Name: Double End Wrench Material: Carbon Steel System: Metric Color: Silver Color Surface Treatment: Polished Chrome Features: Dual Open Head, Not Easy to Rust, Wide Use Specifications: 1: 6 x 7mm, 2: 8 x 10mm, 3: 9 x 11mm, 4: 10 x 12mm, 5: 11 x 13mm, 6: 12 x 14mm, 7: 13 x 15mm Size Details: 6 x 7mm: Length: 12.5cm/4.9", Opening Thickness: 0.4cm/0.2", 0.45cm/0.2" (Approx.) 8 x 10mm: Length: 15cm/5.9", Opening Thickness: 0.4cm/0.2", 0.55cm/0.2" (Approx.) 9 x 11mm: Length: 16.3cm/6.4", Opening Thickness: 0.45cm/0.2", 0.6cm/0.2" (Approx.) 10 x 12mm: Length: 16.2cm/6.4", Opening Thickness: 0.53cm/0.2", 0.58cm/0.2" (Approx.) 11 x 13mm: Length: 16.2cm/6.4", Opening Thickness: 0.53cm/0.2", 0.58cm/0.2" (Approx.) 12 x 14mm: Length: 19cm/7.5", Opening Thickness: 0.6cm/0.2", 0.65cm/0.3" (Approx.) 13 x 15mm: Length: 19cm/7.5", Opening Thickness: 0.65cm/0.3", 0.7cm/0.3" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Wrench