Wera 8740 C HF Zyklop In-Hex Sockets with Holding Function via a unique design, hold on the socket-head fasteners. Assembly or disassembly becomes easy where fasteners are recessed or in awkward spaces or where overhead work is necessary. Wera’s Hex-Plus drive design allows up to 20% more torque to be transferred and prevents rounding out and fastener head damage. Made from chrome-molybdenum, these are designed for intensive use and are also guaranteed for production use with non-impact power tools. \"Take it Easy\": the In-Hex sockets are colour coded dependent on the size for fast tool selection; part of the wider Wera size identification system. The set features secure “Twist-Lock” tool retention for easy selection and safe storage in a structured fabric pouch. Contains 10 pieces 60mmx 1/2\" drive In-Hex sockets; 10,11,12,13,14,15,16,17,18,19mm. Wera - Inventors of Zyklop.