Specifications: 3/4" diameter at tip, circumference = 2.355" 15/16" diameter at mid-ridge, circ. = 2.94" 1 3/4" from main body to perineum pressure point. Use: Place the head into the anus. Make sure that the curled arm (handle) is between the buttocks and the upturned arm touches the perineum. The item itself should be tilted forward. Please note: This particular item is best used by experienced users who are adapted to products of this nature.