Tender For bid to ras corrigendum : supply of pneumatic air winch of 0.6 ton capacity with wire rope of length 30 metre for racking board , pneumatic air winch of 1 ton capacity with wire rope of length 30 metre for monkey board , pneumatic air winch of 2.5 ton capacity with wire rope of length 183 metre for derrick board , pneumatic air winch of 5 ton capacity with wire rope of length 183 metre for derrick board