Calunce Velcro ESD/Antistatic Wrist Strap with 2.5M PU Adjustable Grounding Wire These wrist straps enable you to ground yourself while working on sensitive electronics. Protects your computer from electrostatic discharge damage when you are installing or replacing hardware, such as memory modules, graphic cards, etc. With the special metal ring adjusting structure, the loop in shape of arc is more suitable for ergonomic design, which is comfortable for workers to wear. The loop adjusting is more convenient, accurate and fast. Never connect yourself or any hardware you are working on to the mains electricity or any other electric power supply.