that 3 way weld up tool is pretty neat.

Silca had a 2 way tool that had a .250 hex socket as the 3rd leg. Looked neat ! But the allen bits are so soft, they twist right off under moderate torque.

by far the best allen keys available are the Wiha tools. They are slightly "cupped", like a Flank Drive socket. Really great.

and don't forget your hex bit to 1/4" square drive adapter. Very handy

/markp