Made from high-quality chrome-vanadium hardened steel for maximum torque and comfort. Each piece is shaped for an optimal fit, and a non-slip rubber overlay eliminates hand fatigue. The ball-end shaft allows up to 30 degrees for misalignment, making these tools perfect for tight or awkward spaces. Each tool has a shank length of 3-3/8" to 5", width of 3.75" to 5.13", and weight of .06 lbs to .44 lbs. Exceeds ASME/ANSI specifications. Features: Black oxide finish resists corrosion; Additional square cut drive for high torque applications; Limited Lifetime Warranty.