Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Fast Slow Assembly 2mm by PERRIN Sale $29.30 | / SKU 73-5022 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 Fast Slow Assembly 2mm regulates the speed (specifically) of a mantel clocks. The Fast Slow Assembly 2 mm has a 2 mm shaft.