Ergonomic shaped anal plug for easy insertion.Finger and lube insertion. Open wide tunnel plug. The Open Wide Tunnel Plug by MenzStuff can provide completely new possibilities to anyone who likes to use a butt plug. It has an ergonomic smooth shape for easy insertion and gets wider towards the base. With a tunnel plug it is easy to insert lube a finger or a vibrator in the anus. The sensation of the anus being spread wide open with a tunnel plug is reported to be spectacular by those who love anal sex. The anchor at the base enhances the sense of security while using the tunnel plug.