
I am a qualified automotive technician. I've only recently started using them, but they've already become one of my most used tools. Essential for fastening small screws in hard-to-reach or blind places, e.g. B. in the car interior or heater housing screws. I used to only have a magnetic extension cord that went through an outlet. Not only did they not have sufficient magnetic force, they also did not fit through heads smaller than 3/8 inch or 10mm. This forced me to use improvised methods to hold the screw, using small pieces of paper wedged into the socket. However, the magnetic force holding the clasp in place can work against you. Sometimes the extension will pop out of its socket and remain on the clasp. They really should be used with extensions that have a locking mechanism.

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