Quickly and Easily Release STC Fittings. The angled head provides extra clearance in tight spaces. Works on GM step vans with Allison transmission cooler lines and Ford 6.0L/7.3L high pressure oil lines. Also works on Case International and John Deere tractors: hydraulic lines, power steering lines, cooler lines, and brake lines. Double-dip grip for comfort. Includes three sizes: 6, 8, and 10.