Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Threaded Knob for Setting Synchron Motors by PERRIN Sale $1.50 | / SKU 74-739-6 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Add to cart Spinner icon Notify me when back in stock Email address Email me when available This setting knob has a reverse thread of 3.2 mm (1/8"). Outside diameter is 12.7 mm (1/2"). Sold individually.