provision of operational stores , punched tape concertina coil ( including spike handle ) with 50 turns and dia 1050 mm having a 2 . 6 mm dia core wire of high carbon spring steel of high tensile strength . the punched tape and core wire are elecyro galvanised to provide protection against outdoor exposure . the punched tape is mechanically crimped over the cover wire and then formed in to a coil at various parts of the periphery of the coil steel clips connect the individual turns of the coil to each other so that it opens up like an accordion . the width of barbed as 9mm and spacing of clips 23 . 5 mm to 24 . 5 mm c/c the weight of each coil will be 15 . 2 +5% kgs without packing material and coil length 15 mtr when opened up . each coil wound with bituminized hessian cloth for providing protection coating as per specification no ind/eng/prov/1245 is for raw material and drawing imga 0112/b ( sheet 1 of2 ) , impd-1821/b and impd-1822/b . ,