Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Clock Regulator Crank 7 by PERRIN Sale $5.40 | / SKU 74-233 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 Clock Regulator Crank 7 a Vienna and American Regulator crank sized as 7 which measures 3.8 mm.