Single Flare > 12 gauge ~ 2.0mm > 2 gauge ~ 6mm > 1 gauge ~ 7mm > 0 gauge ~ 8mm > 7/16 inch ~ 11mm > 1 inch ~ 25mm > 1-1/4 inch ~ 32mm > 1-3/8 inch ~ 35mm > 1-1/2 inch ~ 38mm > Stainless Steel