Unique Design: The wrench's jaws are designed with return tabs for better leverage or more grip to slide easily over your fasteners Extended Range: The crows foot wrench set extends the range of a standard wrench to inaccessible fasteners in tight spaces that are normally inaccessible. Once in place, an existing ratchet, extender or torque wrench will attach to the crowfoot drive holes to drive fasteners. Metric crows foot wrench set are 100% compatible with existing metric 3/8” and 1/2” drive tools to meet all your needs High-Quality Material: The gear wrench crowsfoot is made of alloy steel, which is strong and durable, rust-proof and corrosion-resistant, ensures the maximum torque of the wrench, and effectively prolongs the use time of the product.