Wera 950SPKL Multicoloured Ball End Hexagon Allen Key Metric 4mm

The Wera 950SPKL 4mm Multicoloured Ball End Hexagon Allen Key is one of the most commonly specified sizes across professional trades, making it an essential addition to any toolbox. At 4 x 137mm, it delivers excellent leverage for driving hex socket screws in automotive, mechanical engineering, and general workshop applications. The Hex-Plus profile provides a larger contact surface within the screw head than a conventional hex key, substantially reducing the notch effect and protecting fastener