Keyless drill chuck
HERMAN BF-21 Prima ½ʺ
For Impact drivers

Non-slip surface treatment by coating:
allows reliable clamping of the tool even with oily hands

AUTO-LOCK SOUND function:
allows quick instrument change without the need for an additional instrument with an audible click sound when locking

ANTI-LOCK function:
prevents the tool from loosening when the tool is switched off and minimises jaw jamming due to inertia when releasing the tool

Positioning of chuck housing by flexible ratchets:
a small tightening force is sufficient for a controlled and firm tool hold

High fatigue life:
allows more than 12,000 x tighten and loosen tool

Recommendation:
Do not leave the chuck dry and, especially when working in wet environments, use cutting oil to lightly lubricate the moving parts