Lincolnshire Police have released CCTV footage which appears to show two men stealing lead from a shop in Market Rasen.
Lead has been stolen from above the shop door of Spring Beauty Rooms on Market Place Walk on three separate occasions in recent months.
Officers believe the offences are linked.
The incidents took place on November 10, November 27 and December 5, which is when this CCTV footage was recorded.
Anyone who recognises the two men should call police on 101, quoting incident 115 of November 27.
Alternatively, contact the independent charity Crimestoppers anonymously on 0800 555 111.