Chrome vanadium steel. Hardened and tempered. Metric and imperial hex key sets. Sizes: 1/16″, 5/64″, 3/32″, 1/8″, 5/32″, 3/16″, 7/32″, 1/4″, 5/16″ & 3/8″. Includes storage clip. Chrome vanadium steel. Hardened and tempered. Metric and imperial hex key sets. Sizes: 1/16″, 5/64″, 3/32″, 1/8″, 5/32″, 3/16″, 7/32″, 1/4″, 5/16″ & 3/8″. Includes storage clip.