supply of lock boltlock bolt,lock bolt size: nominal diameter 22.2 mm or 7/8 inch with collar grip range 57.15 to 63 .50 mm. one set consisting of 1 no. lock bolt & 1 no. collar as per rdso drg. wd-11036-s-01 alt-01 an d wd-11036-s-02. material & specification as per drawing. the head of the lock bolts necessarily be marked with manufacture identification. the marking on collar should be done on lower bottom surfac e. firms offer - lock bolt round headed 7/8 (22.2mm) dia with full collar zinc plated with grip range 57.15 to 63.50mm as per rdso spec. no. is/rdso-wd/0001:2022 [ warranty period: 30 months after the date of delivery ] ] , lock bolt size: dia. 19.1 mm or 3/4 inch with collar grip range 31 to 38 mm. one set co nsisting of 1 no. lock bolt & 1 no. collar as per rdso drg. wd-11036- s-01 alt.01 and wd-11036-s-02 alt. nil. material & specification as per drawing. the head of the lock bolts necessarily be marked with manufacturers identification. [ warranty period: 30 months after the date of delivery ] ]