Tools were stolen from a van parked in Wentin Close, Corby, in the early hours of Friday, July 28.
Two white men, both in their early 20s and wearing light-coloured clothing, broke into the white Ford Transit Connect sometime between 12.30am and 1am.
One of the men wore an Adidas trainer-type jacket, jogging bottoms and a baseball cap which appeared to be being worn back to front.
The second man wore shorts and a hooded top under a sporty-style zipped jacket.
Witnesses, or anyone with any information about the theft, are asked to call Northamptonshire Police on 101 or Crimestoppers anonymously on 0800 555111.