Regeneration work on the North Quay in Douglas has been held up after it was discovered a whole pallet of kerbstones has been stolen.
They're silver-grey in colour, measure six inches by two and are finished in natural granite.
It's thought around 64 were taken some time between November 6 last year and July 19.
The contractor can't replace the blocks meaning work will be delayed by some time, adding to the cost.
The Police are urging you to come forward if you know anything or witnessed the theft and say all information will be treated in the strictest of confidence.