Sometimes you cut of one side, or even both sides of a bolt through joined parts and they are still rusted in place. An air hammer/chisel or electric equivalent is very similar to a hammer drill but the tip doesn’t rotate.
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4.0
£38.98
Corded Rotary Hammer Drill 1500W SDS Hammer Drill with Multi-positional Side Handle, 4-Functions Heavy Duty SDS Plus Rotary Hammer Drilling, Including Drill...

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4.0
Evolution Power Tools SDS4-800 Hammer Drill 4 Functions - Drill, Chisel, Rotation, Hammer, 5 x Attachments Included (230 V)