The Ace 9-in-1 hex key set is made with S2 Steel that is heat treated, quenched, and tempered for optimum strength, torque, and flexibility for safety and coated with a rust-resistant finish.

Product Features:

• Fold-up sets that have an ergonomic hard plastic shell that is stronger than steel and has a soft plastic over mold for comfort, slip resistance and safety
• The hex keys (allen wrenches) are used to drive internal hexagon socket (allen head) fasteners
• Long lasting