Cow head locks 1200A 1.20m/cow,for dairy 1000A 1.00m/cow, for dairy,dry cow; 750A 0.75m/cow, for young cow; 6 Cow head locksOur design experts will help you match the right cow head self-locking system to your various dairy cows needs. Motile pole: Ø42mm round tube;Rail: Ø50*40*3mm Square Steel Tube;Hot galvanized and painted weld with neck self lock system.material: hot galvanized