The Master Lock S601 Group Lockout Box is made from stainless steel, to withstand the toughest environments. It includes 19 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. It also features a side window, offering visibility to unused locks. The stackable design facilitates storage and simplifies transporting multiple boxes."