1. The shape is L-shaped, and it is a special tool for a hexagon socket screw; 2. Hexagonal rod shape, simple and light, is specially used for turning hexagon socket screw. Specification of hexagon sp
An Allen wrench is also called an Allen wrench. Common English names are "Allen key (or Allen write)" and "hex key" (or hex write). It exerts the force on the screw through the torque, which greatly r
