Drywall Screw TB3.5x55mm (1000pcs/pkt) KNAUF,Black phosphate self-tapping screws with countersunk phillips heads, for fixing plasterboards to metal framing. The fasteners are for use on steel thickness between 0.7 mm to 2.0 mm. The screws are tested and they comply to ASTM C1002 – 07. KNAUF
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