The 951 Hex Key wrench by Beta Tools of Italy is made by forging the hex key shapes into the ends of a round bar rather than cutting off the extruded hex bar to create a hex key wrench.
According to the manufacturer, this extra step of forging the hex-end into a bar of steel provides a harder hex key that wears longer, as well as offers a more precise fit with the fasteners. 
The 951 T-handle also provides three usable ends.
Beta Tools makes a complete line of T-handle wrenches in SAE, metric and Torx. They are available in a fixed-head or swivel-head option. 
