Steel Screw Flesh Tunnel - 2 Piece Screw Tunnel with one rim that screws on and off. Available in many variations but in the most popular plain style, TDi Body Jewellery stock Screw Tunnels in Surgical Steel, Black Steel, Zircon Steel (gold colour), and also Acrylic styles. The sizes vary between the different materials, with the smallest being 2mm and the largest being 30mm.