Master Lock S600 Group Lock Box is made of 430-grade stainless steel to withstand the toughest environments. • The rugged construction offers enhanced design features, making this box stronger and easier to use. • The S600 includes 19 total lockout holes, including one on the front latch for the operations lock. • The box includes a removable cup that creates a clear, impact-resistant window on the front, allowing participants to see keys are secured inside the box during a group lockout. • The stackable design facilitates storage and simplifies transporting multiple boxes. • Replacement removable key cups are available. Read More