Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Clock Regulator Crank 5 by PERRIN Sold out $5.40 | / SKU 74-231 Availability: Translation missing: en.general.icons.icon_check_circle icon Out of stock 1 2 3 4 5 6 7 8 9 10+ Quantity Chevron down icon Quantity Sold out Spinner icon Notify me when back in stock Email address Email me when available Clock Regulator Crank 5 an 8 day American Regulator crank sized as 5 which measures 3.4 mm.