iFixit Anti-Static ESD Wrist Strap
Prevent electrostatic damage.
"Rapid static dissipation by a wrist strap ground is required to prevent voltage spikes. Simple movements such as lifting one foot off the floor or raising one arm from a conductive table mat may change body capacitance by as much as 10% to 30%. Uncontrolled, the capacitively created voltage may reach several hundred volts or more."