annual rate contract for the supply of barbed wire and u-nail stapples ( isi marked ) annual rate contract for the supply of barbed wire and u-nail stapples ( isi marked ) , galvanized steel barbed wire for fencing ( isi marked ) coated as per is: 4826-1979, 12x14 swg 2 strand in 4 barbes & 3” to 4” apart without wooden spools conforming to isi specification no. 278-1978 ( re-affirmed- 2001 ) ( with latest amendments ) . the wire shall be hot dipped galvanized heavy coated , mass of zinc coating as per is: 4826-1979. , u- nails stapples for fencing the barbed wire of 4.064 mm ( 8 swg ) hot dipped galvanized heavy coated , mass of zinc coating as per is: 4826-1979. , -do- 3.251 mm ( 10 swg ) .