The wera 950 spkl9 hex plus holding function l key set the long arm of each hex key features a ball end design which allows off angle screws to be accessed which is particularly advantageous in confined spaces in addition the holding function hf element securely holds screws thanks to a clamping effect achieved by a flexible locking ball the hf system is especially helpful in confined hard to reach spaces where there is no room for a second hand to hold the screw traditional hexagon socket screw