Answer / amit

it depends upon dia of bars...for example HYSD Bars as per IS 2502
     Dia of bar           Hook's length
       upto 8mm              90mm
            10mm             110mm
            12mm             130mm
            16mm             175mm
            20mm             225mm
            25mm             275mm
            32mm             350mm

Answer / shamim ahamed

2*10d

Answer / mukhram singh

it depends upon dia of bars...for Hook's length both side 
2*10*dia.            

Answer / gadhtoda nishant

9d

Answer / murugaperumal

20 d

Answer / paras bhanushali

9d

Answer / v.murugan

20d theroetical 8d practical

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