Hex Wrench

A tool commonly used to tighten and loosen screws or bolts with an internal hexagonal socket, which also called Allen wrench.

There are two most shapes, L-Shaped and T-Shaped, hex wrenches are commonly found in L-shaped and T-shaped designs. 

The L-shaped Allen wrench is the most common, featuring a long and short arm, making it versatile for different angles. 

The T-shaped Allen wrench, with its additional handle for greater leverage, is ideal for applications that require higher torque.