High-quality L-key group, with color coding, convenient plastic sleeve. This ensures that the tool is a fast hand and that ergonomics and comfortable handling are easy hands, even at low temperatures. The wear-resistant clamp material ensures the safe storage and simple disassembly of L-type keys. The hexagonal normal section provides a larger contact surface at the head of the screw. Therefore, the cutting effect is minimized and the screw head damage is more or less eliminated. The ballpoint pen on the long arm can work reliably even when it is difficult to install. Black laser surface treatment provides excellent surface protection, even anti-corrosion, and long service life. Laser engraving, so wear-resistant dimension markers on the L-key fast access The difference between a ball head and a flat head: Flathead (It can increase the force): The flat-head inner hexagon wrench is used to screw the deep hole nut, which has a large force bearing area and can be used for increasing force, with large torque. Ball head (It can't increase the force): The ball head inner hexagon wrench can be used at multiple angles, and it is easy to enter the hex nut, with relatively small torque.