A quality hex key set with 25 straight end hex keys. Finished in a black oxide coating for corrosion resistance. In a range of both metric and imperial sizes. 1.27, 1.5, 2, 2.5, 3, 4, 4.5, 5, 5.5, 6, 7, 8, 10mm 1/16, 5/64, 3/32, 7/64, 1/8, 9/64, 5/32, 3/16,7/32, 1/4, 5/16, 3/8 inch.