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Jul03

Driver for screw which has no groove on the top

hnezi.jpg
Driver which can screw up the screw with no groove on its top. It uses ceramic material which swell and shrink by electric voltage. It transforms the swelling movement into the rotational movement and will screw down. Once you screw down these no groove screws with this driver, it's difficult to take out them. It is good to use as an antitheft device.
(NTT/ via asahi.com)

EDIT