collar phy 84 x 30 for enhanced capacity screw coupling to rdso drg. no. sk- 99002 alt. 5, item-9. matl. & spec.- is:2062/2011 with amndt. no. 1 of nov. 2012, grade - e 250 c and confirming to rdso spec. no. c-9505 revised august 2001.
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