Function: Open wrench comes with light weight, one-handed operation reduces driver fatigue 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 Alloy steel material has high strength, high toughness, wear resistance, corrosion resistance, low and high temperature resistance The adjustable area of the large head opening is 11-16mm, the adjustable area of the small head opening is 5-11mm, and the thickness is 9mm 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