supply of single sheave pulley block , single sheave pulley block wheel size 3-1/2 x 1/2 grooved steel load of capacity 2.5 tonne as per requir ement and quality of standard.( make : im, mahadev, pec, srec, sste or similar ) is 13156 (1991) for sheave pulley block & as me b30.9-2021 for steel [ warranty period: 30 months after the date of delivery ] ] , single sheave pulley block 6 x 1 groove steel, suitable for load capacity 3 ton. (make - im, mahadev, pec, srec, s ste or similar) is 13156 (1991) for sheave pulley block & asme b30.9-2021 for steel wire rope sling. [ warranty period: 30 months a fter the date of delivery ] ]