Small outside diameter is 7/8". Medium outside diameter is 1-1/4". Large outside diameter is 1-1/2".Spirals$26.00PriceGaugeSelectSizeSelectMetalSelectQuantity*Add to CartMost designs and sizes are available in:Stainless Steel (316LVM ASTM F-138) Brass (85% Copper/15% Zinc) Copper (straight up copper)