Diamonds are no longer just a girls best friend! With the E-Stim Diamond Head Penis Plug diamonds are now a guys best friend! This beauty measures in at 2 inches total, but only 1 1/2 inches are insertable with a 8.5mm diamond shaped head. At the base of the plug you will find a 4mm socket. Insert gently ( like a regular penis plug ) with plenty of lube. Once comfortably inserted you can attach the plug to the power box ( SOLD SEPARATELY ), and let the fun begin!