Small part, but the right part. On machines, "close enough" hardware and components are how repairs turn into re-repairs — factory thread, factory grade, factory fit means it goes on right the first time and lasts the way it's supposed to.
This is the genuine Nilfisk Advance OEM 145 5115 000 CASTOR, part number 145 5115 000, brand new in the box. Whether it's a wear part, a consumable, or a component you don't touch often, genuine OEM is how you know you're not going to see it again next month.
Not sure this is the right part for your machine? Send us the model and serial number and we'll confirm the fit before you order.