Ram RAP-S-KNOB3U Pin-Lock Security & Key Knob 1 Diameter B Size Arms

The RAP-S-KNOB5U consists of a 5/16-18 female threaded security knob and key knob. The RAP-S-KNOB5U replaces all knobs on 1.5 diameter C size arms and mounts. The RAP-S-KNOB5U offers the ideal amount of leverage to properly tighten your mount to prevent slippage in heavy chop or in extreme vibration environments.

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Pin-Lock Security Knob and Key with 1 inch B-Socket Arms for RAM Mount - AliExpress