25pcs M8 x 1.25 HSS Thread Repair Tool Kit Insert Wire Inserts Metric Tool

Thread size: M8 X 1.25mm. Thread tap and the drill material: HSS (High-speed Steel). 1PC x HSS screw tap. 1PC x HSS twist drill bit. Check that thread and pitch of the tap and the bolt match. To repair a spark plug thread no Pre-drilling is necessary if using the special Spark Plug Tap.

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