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Bi-Metal Stainless Steel 304 Pan Head Cross Recess Self Drilling Screw ST4.2-18*19

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Bi-Metal self-drilling screw for steel structure building purlins joints.
 
The product use composite metal manufacturing method. The locking part and head of the screw are made of austenitic stainless steel, the thread and the drilling tip part are made of stainless steel SUS410 or alloy steel, and the surface is treated with special rust prevention for longer corrosion life.
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