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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 screws can be easily rounded by the sharp edges of the tool pressing against the inside of the screw profile. The Hex-Plus profile offers greater surface contact in the head of the screw, reducing the notching effect to a minimum and deformation to the screw head is almost eliminated. The greater contact area also enables a greater torque transfer by up 20%. The BlackLaser surface and high corrosion protection offer a long service life, with the round bar design adding further strength and robustness - particularly where the smaller sizes are concerned.