Wera 9 Piece 950 SPKL/9 SM N Metric Hex Key set is designed with Hex-Plus technology to extend the life of Hexagon sockets. Wera Hex-Plus technology prevents the rounding of screws caused by sharp edges of conventional tools gradually wearing the screw head. Hex-Plus tools provide more surface contact transferring up to 20% more torque. Finger protection rubber sleeve with easy-to-grip material ensures comfortable and safe working. Blacklaser hardened blades provide excellent surface and corrosion protection for a long service life. Features ballpoint on long-arm of L-key to insert the tool quickly into screw and work at an angle in confined spaces. Wera's non-wearing material ensures L-keys stay fixed even after frequent removal. Handy fold-over clip with sliding switch opens easy for quick insert and removal of tools. Each L-key is laser engraved with the size of each tool for easy location. This makes them ideal for use in tight assembly or disassembly situations where it is not possible to hold the screw in position by hand. Wera Hex Plus allen keys use a head geometry that guarantees longer life for both screws and tools, whilst providing increased torque. This achieved by the hex key having increased surface contact with the screw, which reduces the notching effect inside the socket. A ball-shaped head at one end provides the flexibility for ""off angle"" applications. The holding function on the long arm of the hex keys is achieved by this ball-end having a flexible locking ball.