article_snippet.sent: the professional gang used a heavy-duty drill weighing 77lb to bore through a reinforced 7ft concrete wall to reach the vault.
article_snippet.sent: the thieves used a £3,500 Hilti DD350 drill, which is commonly used on large construction sites, to drill through the reinforced concrete wall to reach the vault.
article_snippet.sent: Joel Vinsant, secretary of the Drilling and Sawing Association, said that even with high-tech equipment, high-tech equipment may have taken hours for the thieves to drill through the concrete.
article_snippet.sent: Joel Vinsant, secretary of the Drilling and Sawing Association said: ‘What they might have done is to bore several holes with a rig-based drill until they had made a space big enough to get through, rather than boring one hole and breaking through.
article_snippet.sent: It could have taken up to an hour per hole.
article_snippet.sent: Police yesterday revealed the thieves used a Hilti DD 350 drill to get through the two-metre thick vault walls .
article_snippet.sent: It’s got to be a slow, painstaking and methodical forensic process to get in there.