Keyed Alike, Same keyed any one key open all the same group locks Light weight Solid aluminum alloy GREEN body, durable and resists corrosion Dual stainless steel ball locking, Hardened steel shackle with chrome plated. HRC50-55 6pins solid brass cylinder, with high precision pins, anti-pick Designed as a Key retain cylinder system, key remove when the lock well locked. Great for SAFETY LOCKOUT TAGOUT system, this locks was designed with Aluminum alloy body, anodized GREEN coloring offering a security lock, which always used for Safety purpose. lockout dangers sources and machine switches to prevent the accident happen.