Manufactured to ISO 2725 Part 3. With ball intercept ring and rear end knurling for reliable manual precision and a chrome vanadium, brushed chromium plated finish. 8790 HMA Zyklop 1/4 socket, 12.0 mm Wera Zyklop HMA 1/4in drive metric production sockets for hex-head fasteners suitable for manual and non-impact machine applications