The Trillium Steel Locking Anal Plug is the perfect toy for fans of both bondage and anal play. As a simple butt plug, insert the cool steel bulb into your sub, leaving the rubber ring in place to keep the three Trillium steel petals together to maintain the traditional plug shape. Remove the ring and after sliding the plug into place, press down on the outer steel disc at the base of the plug to cause your Trillium to spread its petals and bloom inside. To keep this devious device spread open and your naughty sub from removing their toy, attach the included padlock through the post at the base of the plug. Measurements: 5.63 inch overall length, 2.25 inch long expandable bulb, Collapsed Bulb has 1.8 inch max insertable diameter, Expanded Bulb has 2.58 inch max insertable diameter. Material: Steel, Rubber.