Application Note

The wrist strap ensures a high resistance any charge can flow and can occur thus no potential difference (ie voltage). However, it should be used as a replacement for a wrist band due to the low resistance no simple cable. The built-in anti-static belts resistance, according to VDE standard 1M, prevents the contact with hazardous voltages larger currents can flow to the ground, which could cause serious injury to the wearer otherwise. (Source Wikipedia)

Application find antistatic belts wherever electrostatic discharges are harmful, for example in the assembly of printed circuit boards with electronic components or the assembly of complete assemblies. Similarly, in the disassembly / assembly of a computer or other devices with highly integrated circuits should be taken into a wrist band, unless other measures to prevent ESD have been taken, such as anti-static shoes, table / floor coverings. In the absence of anti-static measures ranges may have a touch of an exposed contact to destroy a component.