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Designed and manufactured by Monument, these 20 inch heavy-duty manhole lifting keys measure a length of 500mm. The manhole cover lift keys are zinc plated and feature rectangular-shaped ends.Features & Benefits: Monument MLK20 Manhole Cover Lift Keys - 500mm, Length 500mm, Zinc plated, Rectangular shaped ends, Heavy-duty. Monument MLK20 Manhole Cover Lift Keys - 500mm