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Security Products
Mather and Platt owned a subsidiary company,
Security Lock and Safe (SLS), which was responsible for the security
products business. SLS manufactured security alarms and a range of floor, freestanding and wall-mounted safes.
The larger safes were cast in the Park Works foundry. Key design features of the safes were a corrugated chilled cast
iron outer casing with nickel nuggets embedded in the wall material. The corrugated surface made it difficult to
start to drill a hole and using chilled cast iron produced a very hard skin that also made drilling difficult. If
drilling did succeed, then the nickel nuggets deflected the drill in an attempt to hamper further progress.