Zoom icon Click to expand Tap to zoom Chevron down icon Chevron down icon Top Block Medium by PERRIN Sale $19.60 | / SKU 78-360-2 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 Top Block Medium is a medium sized top block for 400 Day Suspension Units. Measures 8.00mm x 6.00mm.