I you are refurbing your brake calipers fit these bleed nipples and never have to worry about them again rusting or seizing. Made from stainless steel with a M8x1.25mm thread and comes with a dust cap.
If you are not sure if the bleed nipple you want to replace has a M8x1.25mmm thread. Try a 8mm spanner on it and if it fits there is a very good chance this is the bleed nipple you want.
Part number 4 & 5 in the exploded view
Price is for one bleed nipple including dust cap