This brake hose / brake line was used on a variety of classic BMW models. It is also commonly used when upgrading an E30 brake master cylinder to the larger E32 7 Series master cylinder.
This straight hard-line brake line is 620mm in length (approximately 24 inches long) and has M10 male ends on both ends.
This is BMW part # 34326755585 (34 32 6 755 585) which can also be used to replace the previous (older, obsolete) BMW part numbers 34321153689 (34 32 1 153 689) and 34321108037 (34 32 1 108 037).
BMW Fitments:
3 Series
E21 (75-83) > 320i
5 Series
E12 (77-81) > 528i
E12 (77-81) > 530i
5 Series
E34 (89-95) > 525i M20
E34 (89-95) > 525i M50
E34 (89-95) > 535i
E34 (89-95) > M5 (91-95)
7 Series
E23 (77-87) > 733i
E23 (77-87) > 735i
7 Series
E32 (88-94) > 735i
E32 (88-94) > 735iL