supply of lock bolt , 15.88 mm lock bolt and collar with required grip range 25.4 to 31.75 mm confo rming to rdso specification no. is/rdso-wd/0001:2022. [ warranty period: 30 months after the dat e of delivery ] ] , 1/2 (12.70 mm) dia. zinc plated/galvanized lock bolt with collar, grip no. 8 with grip range 12.70-19.05 mm. material and specification: rdsos 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 18 to 25 mm. confirming to r dso specification no. is/rdso wd/0001:2022 [ warranty period: 30 months after the date of delivery ] ]