Plugs, Tunnels & More > 6 gauge ~ 4mm > 4 gauge ~ 5mm > 0 gauge ~ 8mm > 1-1/8 inch ~ 28.5mm > 1-3/8 inch ~ 35mm > 1-1/2 inch ~ 38mm > 1-5/8 inch ~ 41mm > 1-3/4 inch ~ 44.5mm > Black Stainless