Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Clock Regulator Crank 1 by PERRIN Sale $4.15 | / SKU 74-227 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 1 a Vienna and American Regulator crank sized as 1 which measures 2.6 mm.