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Chipboard Screw

Dia :3.0mm~12.0mm (#4~3/8)
Length :
6mm~400mm (1/4"~16")
Advantages :
- Patent recess design: firmly sticking tight, and easy to operate in any angle.
- Recommend for long screws, usage capable to keep drilling straight easily.
- Available to fit wide range of screws with any head & thread type.
- Both BI-SQ bit and square bit can drive BI-SQ driver screws.
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