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Bi-Metal Hex Flange Self Drilling Screw ST5.5-24x38, 5#

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Bi-Metal self-drilling screw with EPDM washer for fixing the roof or wall of the steel structure envelope system with thick purlins and H-shaped steel.
 
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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