supply of set of screw coupling , set of screw coupling 3 items consisting of : 1.screw (dia 58x453) with bent coupling for en hanced capacity screw coupling to rdso drg. no. sk-99002, alt.5, items-3&4. matl.& specn.- as per rdso spec. no. c-9505(revised) ,amendment 1 of october 2016. 2.trunion(right hand thread) for screw couplin g, to rdso sk-99002, alt-5, item no. 6. rdso spec. no. c-9505 (revised),amendment 1 of october 2016. 3.bent coupling link together with trunnion (l. h. thread)for enhanced capacity screw coupling to rdso sk-99002 alt-5, item nos. 2 and 5. material and specification conforming to rdso spec. no. c-9505 (revis ed), amendment 1 of october 2016 [ warranty period: 30 months after the date of delivery ] ]