A heavier gauge screw, generally used where extra strength is required such as attaching hinges to steel reinforced frame. Approval All tested to BS EN ISO 9227:2006. UKAS Accredited. In accordance with BS 7412 and both the BPF and GGF guidelines. Corrosion Rating 2 - Occasionally damp/wet, rural and sheltered areas Description A heavier gauge screw, generally used where extra strength is required such as attaching hinges to steel reinforced frame. Driver Bit Size PH2 Finish Zinc Head Type Countersunk Length mm 25 Material Carbon Steel Max Drilling Thickness mm 4.0 Pack Dimensions L x W x H mm 180 x 90 x 90 Pack Weight kg 2.594 Point Type Self-Drilling Product Code 423Z Recess Type Phillips Size mm 4.8 x 25 Substrates Steel Thread Dia. mm 4.8 Thread Type Self-Tapping