This is the Pro-Series Tools 4.0mm Allen Driver
By HPI Racing
FEATURES: These professional quality tools feature solid aluminum construction,
CNC machining, chunky handles with knurled grips at the tip end and
laser-etched markings for instant size identification. The tips are
factory-ground then hardened and black-coated for extra-long life and
good looks, and are easily replaceable.
The handle is made of aluminum and is gunmetal gray in color.
The tool tip is steel.
SPECS: Length: 7" (178mm)
Handle diameter: 22mm (7/8")
Handle length: 98mm (3-7/8")
Exposed tool shaft, length: 80mm (3-5/32")
diameter: 5mm (5/32")
Driver tip, hex width: 4.0mm (5/32")
length: 3.7mm (5/32")