If you want to put a little or a lot of pressure on your or someone elses nipples, these small screw clamps will work well.  You can screw one, two, three or all four screws down to make these fit perfectly.

Should you want to get even more intense stimulation, electrify them.  :)  A large alligator clip or other method can be used to connect one wire from a lead wire to each one of them.  It is recommended that if you do electrify these devices, you use a TENS pad next to each nipple connected to the same lead wire as the nipple clamp.  This is done to keep the + and - current flow close to the nipple and prevents it from moving across the chest area. 

 It is not recommended to connect each clamp to one set of wires on one channel of your power box.  Doing this will run current across the chest and could result in abnormal heart beats.  If you have any electronic medical device, such as a pacemaker, DO NOT USE ELECTRIFIED NIPPLE CLAMPS.   

                                                                    22mm (.87" or 7/8") Diameter