These are simply bits for very special security screws/bolts. I needed one to take the bottom plate off the base of my Margaritaville Blender. Not sure why they didn't use simple Philips head screws, but they didn't. I put the bit into my power screwdriver and it worked easily. The magnetic feature was useful because the screws were small. I only needed one size for one job and may never use these again. But, it was the only way to fix my appliance, so the price of the set was much much less that replacing the appliance.
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