The Arrowmax AM-410140-BG Allen Wrench is an RC-scale hex driver sized 4.0 x 120mm designed for use with 4.0mm hex screws found on model chassis and components. The tool's length gives reach for recessed fasteners and tighter work areas while the listed black golden finish identifies the surface styling rather than material construction.
This wrench is intended for standard assembly, setup and on-track adjustments of RC models, assisting with tasks such as chassis alignment, suspension trim and servo mounting. It serves a tuning role by providing a consistent tip and shaft length to reduce hand fatigue during repetitive tightening or loosening steps.
Because the manufacturer does not publish additional material or treatment details beyond the finish, users should check tip condition before precision work and replace if the tip shows wear to avoid rounding hex screws.
Use this 4.0 x 120mm Allen wrench as a general-purpose hex driver for RC assembly and setup, keeping it clean and stored dry to prolong tip life.
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