The accused had allegedly robbed 8 shuttering plates each weighing around 35 Kg from the construction site, at around 2.15 am on May 29, said Vijay Singh, DCP(north west).
The watchmen on the site Surender and Pappulal told police that ten boys had reached there and robbed the steel plates by cornering them on knife point, he said.
The cops zeroed on three suspects and arrested them. The suspects led them to the godown of a scrap dealer from where the stolen property was recovered, said the officer.