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Yushung is the most comprehensive factory making silicon bronze wood screws with cutting threads in fastener industry.
Standard:ANSI,DIN,GB,etc.
Main specs:4g - 24g
Length:3/8" - 6".
Drive:Slot,R&P,Square,Torx,Hexagon,etc.
Meanwhile,Yushung produces lag botls with cutting threads,finishing cup washers.