Feature: Open-end wrench: light weight, one-handed operation reduces operator fatigueEnds: both ends are available, very versatile. Take a thicker design, the overall thickness is extended Practical: the rotation can adjust the required specifications to reduce the difficulty of work, very practical Alloy steel material: alloy steel material has high strength, high toughness, wear resistance, stable, low and high temperature resistance Adjustment range: the adjustable range of the large head opening is 11-16 mm, the adjustable range of the small head opening is 5-11 mm and the thickness is 9 mm 9 This double-ended wrench is made of forged and heat-treated carbon steel for lasting strength and durability. Suitable for a variety of screws and nuts, the opening is flat, protect the screws and nuts, and reduce friction. Both ends are available, very versatile. Adopt thicker design, overall thickness is widened Rotation can adjust the necessary specifications to reduce the difficulty in the work, very practical Specification: Item Type:Opening Key Material: Alloy Steel Adjustable range for large head opening: approx. 11 ~ 16mm / 0.4 ~ 0.6 inch Adjustable area for small head openings: approx. 5 ~ 11mm / 0.2 ~ 0.4" Thickness: approx. 9mm/0.4" Package List: 1 x Open Wrench