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The electric tool may be provided with a 4-corner joint for a screw sleeve.  The original 4-corner joint is provided with a single-sided fixing ball.  However, the patent granted 4-corner joint is improved with double-sided fixing balls.  When the patent granted 4-corner joint having been inserted into the electric tool rotates at a high speed, the double-sided fixing balls may achieve shaft rotation without any bias or vibration.

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1/4" hexagonal tube inspection film:​