What are the benefits of an offset handle?

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  Radiator key offset handle  

Many Allen or hex radiator keys have offset handles. This means that the bend in the key is not a made at a right-angle, or 90 degrees, but at a slightly wider angle.

  Hex key in radiator valve tail  

When turning a tail valve to remove or tighten it, the offset handle slopes away from the side of the radiator, saving the skin on the operator’s knuckles!