Step-up adaptors: 1/4"D (F) to 3/8"D (M), 3/8"D (F) to 1/2"D (M), 1/2"D (F) to 3/4"D (M). Step-down adaptors: 3/8"D (F) to 1/4"D (M), 1/2"D (F) to 3/8"D (M). Full 360° rotation at angles up to 40° allows access to hard to reach spaces. Specially designed to allow the U/J to be locked in-line when required. Pinless construction for additional strength. Manufactured from chrome molybdenum with black phosphate finish.