This is a must for those into fisting! This Anal Expander is made of steel, so it is durable, strong, non-porous and built to last! Compatible with any lube type, it’s perfect for deep, intense penetration and stretching. The center ring is 4 inches wide which allows enough space for most fists to penetrate through. To expand, simply twist the nuts on each of the 4 screws until it reaches your desired level. The dilators will open the anal sphincter so you can easily see inside or insert other body-safe, flanged objects or lubricants.