supply of set of bolster springsset of bolster springs,set of bolster springs for 8 wheeler tower car of beml make. 1). helical spring ou ter wire dia=36mm, l=4593mm conforming to 52cr4mo2v to is:3195-92, 415 to 460bhn after harde ning and tempering & to rdso specification wd-01-hls-94 (rev.-4) and to beml drawing no.901-820 29, item-01, alt.-4, qty.- 01 no./ set. 2). helical spring inner wire dia 26mm, l=3680mm. conforming t o 60si7 to is: 3195-92, 380 to 440bhn after hardening and tempering & to rdso specification w d-01-hls-94 (rev.-4) and to beml drawing no.901-82029, item-02, alt.-4, qty.- 01 no./ [ warranty perio d: 30 months after the date of delivery ] ]