Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Clock Regulator Crank 4 by PERRIN Sale $4.18 | / SKU 74-230 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 4 a Vienna and 1 Day American Regulator crank sized as 4 which measures 3.2 mm.