Why are the hanger tabs on the Speedplate adjustable?

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In some circumstances you will need to adjust the tabs to a wider position as in when a series of lift rings has been added to a manhole frame. The rule of thumb is to keep the opening as small as possible.

Resource Link: https://mrmanhole.com/speedplates/
Additional Link: https://www.youtube.com/watch?v=Lby3n6kD4eQ

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