Bit holder Impact
HERMAN SB-91
¼" hex shank

The TorZon™ flexible torsion zone on the shaft reduces the pressure on the head of the bit holder:
the holder behaves like a strong spring when screwing and thus minimizes the possibility of its breakage even with very high torque impacts created when screwing with an impact driver

Increased hardness of the holder:
the result is very low wear and high strength, but despite the optimized heat treatment, a more fragile design. However, in combination with the flexible TorZon™ torsion zone, the tendency to break the bit is largely eliminated

Bit locking function:
by pushing the holder sleeve towards the shank, the inserted bit is always firmly held against the bottom of the holder thanks to the neodymium magnet

With ¼" hexagonal shank (form E 6.3 according to DIN ISO 1173):
suitable for clamping in three-jaw chucks and compatible with all standard ¼" bits (form C 6.3 or E 6.3 according to DIN ISO 1173)

Surface treatment / shank hardness:
black phosphated / HRC 59~60