Wera 950 SPKS Hex L-Key – 4mm. High quality Wera L-keys with color coded convenient plastic sleeve. The ergonomic and pleasant handle is easy on the hands even at low temperatures. Hex-Plus L-keys provide larger contact surfaces on the screw head. BlackLaser surface treatment provides excellent surface protection corrosion resistance and long life. Laser coated abrasion-resistant size markings on the L-keys for quick access.