The TOUGHSERIES™ fractional folding hex key has the reliability, durability, and control skilled trades need for both precise and heavy-duty applications. Tackle tough jobs using professional-grade s2 keys that deliver high endurance, torque, and 40% less twisting. Get performance you can depend on with a durable construction and Black nickel coated keys that provide 10x corrosion resistance. Utilize the convenience of a push-button to lock keys in place at 90°, 135°, and 180° during use.