| 摘要 |
A device comprising a modification to the system of gears normally embodied as a keyless drill chuck Two (bit grabbing) protrusions (instead of three) are situated opposite each other The shape of each new part is two sides a symetrical three diminsional triangle with a sixty degree angle. Embodiments include such devices as an adjustable bolt driver or a bit for power screw drivers for a conversion to a power adjustable bolt driver. Also included is a (plastic) forked drill bit.
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