CPV code 45510000 designates Hire of cranes with operator in the Common Procurement Vocabulary (CPV 2008), the EU classification used to describe the subject of public contracts.
45510000 is a leaf code — the most specific level of its branch — so it can be used directly as the main CPV code of a contract notice. If it does not quite fit, check the neighbouring codes under 45500000 (Hire of construction and civil engineering machinery and equipment with operator).