supply of supply, erection, testing & commissioning of main hoist dbr, break drum and coupling of 50/6 ton alpha make eot cran , supply, erection, testing & commissioning of main hoist dbr, break drum and coupling of 50/6 ton alpha make eot crane. note: firm has to install the dbr, break drum and coupling in the exist ing control panel by removing existing unit and retrofit and adjust all the parameters as per the load & speed requirements of the consignee. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]