supply of roller lifting device complete of tap changer comprising of (a) extension as per repls pt. no. - s1520-1 or aals pt. no. - g1520-1 = 1 no. (b) hex. socket hd. screw m8 x 25 to repls pt. no. - s1520-2 or aals pt. no. - g1520-2 = 1 no. (c) roll pin dia 4 x 14 mm to repls pt. no. - s1520-3 or aals - g1520-3 = 1 no. for electric locos.roller lifting device complete of tap changer comprising of (a) extension as per repls pt. no. - s1520-1 or aals pt. no. - g1520-1 = 1 no. (b) hex. socket hd. screw m8 x 25 to repls pt. no. - s1520-2 or aals pt. no. - g1520-2 = 1 no. (c) roll pin dia 4 x 14 mm to repls pt. no. - s1520-3 or aals - g1520-3 = 1 no. for electric locos.,roller lifting device complete of tap changer comprising of (a) extension as per repls pt. no. - s1520-1 or aals pt. no. - g1520-1 = 1 no. (b) hex. socket hd. screw m8 x 25 to repl s pt. no. - s1520-2 or aals pt. no. - g1520-2 = 1 no. (c) roll pin dia 4 x 14 mm to repls pt. no. - s1 520-3 or aals - g1520-3 = 1 no. for electric locos. [ warranty period: 30 months after the date of d elivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]