Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the length for a diameter totaling 450 mm?

### Inputs:
table_name: table, columns: ['Name (year commissioned)', 'Owner/operator', 'Length', 'Maximum diameter', 'From/to', 'Licence number']

### Response:
SELECT Length FROM table WHERE Maximum diameter = 450 mm