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The two most popular sizes for hex nuts in the RC industry now have a convenient tool capable of handling both in a single wrench. The JConcepts 5.5/7.0mm combo wrench has major flexibility packed into a compact one-piece design. The main hub of the unit has been knurled for finger tip control and features several heavy cuts for increased grip for those, pesky, hard to turn lock-nuts. The sizing is indicated by laser etching on each end and topped off with JC logo.Convenient combo 5.5/7.0mm design Light-weight design, aluminum material Black anodized Knurled hub for finger tip control Laser etched for size and authenticity