Self Drilling Screw with Pan Framing Head , PH 2 drive , 3# Drilling Point , grey phosphated finish , Hardness HV 450-700 ,  Max Load 2500 kgf . Max Length 250mm ,  14# for Diameter .
Recommended drilling speed 2500 R.M.P , Regarding operation of self drilling screw pls click " Self Drilling Screw Technical  Data "