14 and 12 gauge, inner diameter is 5/16"; overall length is 1-1/2". 10 and 8 gauge, inner diameter is 3/8"; overall length is 1-3/4". 6 gauge, inner diameter is 7/16"; overall length is 2".Cthulhu$41.00PriceGauge*SelectMetal*SelectPair or Single*SelectQuantity*Add to CartMost designs and sizes are available in:Stainless Steel (316LVM ASTM F-138) Brass (85% Copper/15% Zinc) Copper (straight up copper) If ordering a single, pick which side you need from the pic.