My old Craftsman 20v drill charger had a small fan, you can see it was used with 3D printers where the bearing or bushing is broken. Although I had some 1" security bits, they couldn't reach the security screw heads in the deep countersunk holes in the case when the bit was inserted into the screwdriver handle. These longer bits were perfect for this case and can also be used when the security screw is not as deep as in my particular charger.
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