SAE: 5/64", 3/32", 7/64", 1/8", 9/64", 5/32", 3/16", 7/32", 1/4"; Metric: 1.5, 2, 2.5, 3, 4, 5, 6, 8 mm; Made with Cr-V for optimum strength and durability; Strong metal handle provides a secure and ergonomic hold during use; Size markings on every key