Check the listing for details. Adjustment Coupling Knobs for Behringer Xenyx QX1204USB X1222USB QX2222USB, etc. Condition: New. Listed at 4.95 USD. These are replacement and coupling knobs for Behringer Mixers. Coupling knobs allow you to adjust two adjacent settings in tandem. Please measure your machine to ensure fitment with the specific knobs you require. The double long knob has roughly 30mm between the two insert holes. The regular sized double knob has roughly 15mm between it's two insert holes. Replacement mixer knobs Designed by handya on thingiverse:3334294 Created with Eselt - Mobile Optimized Templates for eBay Sellers Payment Created with Eselt - Mobile Optimized Templates for eBay Sellers Links Our Store Seller Profile Feedback About us Contact More items Are you looking for something similar? See our other items! Show more items Contact Send us a message