Allen 56349 Duracast Fold-up Metric Hex Key Set, 7-Piece Heat treated, tempered alloy steel provides high strength and resistance to rotational distortion Rotates to 270-Degree to a firm stop for better torqueing and access Specially contoured handle for better feel and control Rugged Duracast case provides unmatched durability All hex keys are precision formed to exact dimensional tolerances for precise fit