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Jacob's K30 Chuck Key is used on 31 Series and 8-1/2N Chucks. A soft steel handle limits the potential for dangerous fracturing under excessive loads. This thumb grip style of key increases leverage and user comfort.
Nickel thumb grip styles increase leverage and user comfort
Soft steel handles limit the potential for dangerous fracturing under excessive load
Self-ejecting models with spring-loaded ejectors ensure key disengagement after tightening
Never apply extensions, pliers, wrenches or 'cheaters' of any kind to chuck key handles
Do not subject chuck key handles to hammer or other impact blows