The Master Lock No. 406KAW400BLK Dielectric Thermoplastic Safety Padlock, keyed alike – multiple locks open with the same key – features a 1-1/2in (38mm) wide Zenex™ Thermoplastic black body and a 1-1/2in (38mm) tall, 1/4in (6mm) diameter plastic shackle to help prevent electrocution and arc flashing and to prevent electrical current from shackle to key. All components are non-sparking and non-magnetic. Designed exclusively for Lockout/Tagout applications, the durable, lightweight material is easy to carry and padlock has key retaining cylinder to ensure the padlock is not left unlocked.