Blue Spot 15182 Metric and Imperial Hex Key Set 17 Piece Features and Benefits: Manufactured from hardened and tempered steel for increased durability. Soft grip handle for increased comfort and torque. Contents: Metric hex keys: 1.5, 2, 2.5, 3, 4, 5, 6 & 8mm. Imperial hex keys: 5/64″, 3/32″, 7/64″, 1/8″, 9/64″ 5/32″, 3/16″, 7/32″ & 1/4″.