Multiple uses for fitting a variety of hardware to frames where there is a steel or aluminium reinforcement present. Countersunk head with ribs under head for improved countersinking. 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 Multiple uses for fitting a variety of hardware to frames where there is a steel or aluminium reinforcement present. Countersunk head with ribs under head for improved countersinking. Driver Bit Size PH2 Finish Zinc Head Type Countersunk with Ribs Length mm 16 Material Carbon Steel Max Drilling Thickness mm 2.5 Pack Dimensions L x W x H mm 135 x 90 x 60 Pack Weight kg 1.158 Point Type Self-Drilling Product Code 121Z Recess Type Phillips Size mm 3.9 x 16 Substrates Steel Thread Dia. mm 3.9 Thread Type Self-Tapping