Tactile Knob for 6mm rotary encoder 12mm OD x 625mm ID x 12mm H
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Tactile Knob for 6mm rotary encoder (12mm OD x 6.25mm ID x 12mm H)

Tactile knob for the 6mm rotary encoder by uxcell It might fit other 6mm encoders doublecheck the dimensions! ...

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Tactile Knob for 6mm rotary encoder (12mm OD x 6.25mm ID x 12mm H) alternatives