9 Piece, Metric Ball-Hex Key Set, Includes: 1.5MM, 2MM, 2.5MM, 3MM, 4MM, 5MM, 6MM, 8MM & 10MM, Turns 360 Degree At Up To 25 Degree Angle, Extra Torque 8650 Chrome Nickel Alloy, Heat Treated For Maximum Strength, Black Oxide Finish To Resist Rust.