The Ace Metric 9-piece 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:
A plastic holder firmly holds each key in a sized-marked hole so you always have the size you need at-hand
The hex keys (allen wrenches) are used to drive internal hexagon socket (allen head) fasteners
