The K&S KS411 3mm hex driver tip gives a 75mm reach to engage small hex screws commonly found on scale model components. The stamped D=3.5MM and L=75MM identify the tip diameter and the overall length so you can match it to tight mounting points.
As a single replacement head, the tip is intended for use with hex driver handles or bit holders designed to accept long bits. Confirm the bit seating of your holder secures the tip to avoid slippage while working on delicate assemblies.
To protect fasteners and the tip itself, avoid over tightening, use steady pressure, and recheck fastener tightness after initial running; this helps prevent stripped heads and maintains consistent performance of servos, linkages, and chassis fittings.
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