Rails come cut in either 470mm (350 builds), 420mm (300 builds) or 370mm (250 builds). Price is for a pair.
We have began to improve the way these are shipped to you. For Voron Trident we will cut these as the size indicated, for Voron 2.4 we will cut them a ~1-2 CM shorter to ensure you can properly align the rails to the holes (as is recommended in the build guide).
These do not come with the screws and standard mount. If you need those please add them separately, you can find the screws/mount here.