The special design accommodates only the screw head and prevents major damage to the surface the screw head lays on like car underbody protection. The very short design allows to use the sockets in hard to reach areas – ideal in combination with ASTA pneumatic impact ratchet A-6812. Made of Cr-Mo on plastic rail sorted, ½ “drive in sizes: 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23 and 24mm.