Allen 56193 Long Arm SAE Hex Key Set, 13-Piece Heat treated, tempered alloy steel provides high strength and resistance to rotational distortion All hex keys are precision formed to exact dimensional tolerances for precise fit Proudly Made in the USA by Allen, manufacturers of the original Allen hex key wrench Ball end provides up to 25 degrees of access while remaining secured in fastener Tool set includes hex keys in sizes .050, 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16, 7/32, 1/4, 5/16 and 5/8 inches to fit most common sizes of fasteners