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 & Yellow 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 1.121 Point Type Self-Drilling Product Code 121Y Recess Type Phillips Size mm 3.9 x 16 Substrates Steel Thread Dia. mm 3.9 Thread Type Self-Tapping