These are heavy-duty industrial tools known as 'Leader' pipe wrenches. They are used in civil engineering and are consequently made to conform to the most stringent specifications.
The cast iron handle is a heavy 'I' beam construction to ensure maximum strength and rigidity under loading. The teeth on each jaw are hardened and tempered to resist wear. The design of this wrench allows a bigger jaw capacity than the 'Stillson' wrench. The lower jaw is precision seated to prevent harmful loading onto the retaining pin.
Conforms to BS3594 part 1.
SAFETY TIP
Wrenches are designed to withstand the maximum leverage generated by muscle power. Hammering or mechanical levering can cause a failure of the wrench.
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