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Impact Drivers will only accept 1/4” 6.35mm Hex bits. 

The chuck will accept the bit by clicking it into the chuck. The bit should not be able to be removed by just pulling on the end of it, you will need to lift the sleeve around the chuck to release the bit. 

Bits can slip if the tips are very worn or are poor quality. Try the following: 

Inspect the tip of the Bit to ensure it is not excessively worn.  

Ensure you are using the correct Bit for the fastener. Refer to the fastener packaging for correct Bit type and size. 

When driving screws, make sure your impact driver is held straight with firm pressure applied to the Drill to ensure a firm and secure fitment between the Bit and the fastener. 

To drive screws, place forward pressure on the screw while simultaneously and gradually increasing the pressure on the trigger.