13 Piece, Inch Ball-Hex Key Set, Includes: .050", 1/16", 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4", 5/16" & 3/8", 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.