The RAM Locking Knob, includes a brass 1/4"-20 thread, for 1" (B size) socket arms; this allows you to disengage the screwing of the knob. Once you have set your mount in the location you need, you can lock it in place and feel safe that your mounted device will stay right where you left it.
Composite Plastic Knob.
Used to help secure your Ram Mount arm.
Ram Mounts Locking Knob with 1/4"-20 Brass Hole for B Size Arms Reviews
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