In a video available at Serious Male Bondage, BondageFan70 demonstrates the use of high-tech electromagnet hand restraints that are designed for self-bondage.
These 3D restraints use a pair of 12-volt DC electromagnets to lock down the wrists once each of the five fingers are fully inserted into their own restraint tubes. Once your fingers are inserted into the five tubes and the wrist clamp is closed and engaged with the electromagnet, there is absolutely no escape!
See the VIDEO at Serious Male Bondage
Title of this video: THE ADVENTURES OF BONDAGE FAN 70