These are a new set of 8 studs to fit your Weber DCOE inlet manifold. The thread going in is 5/16 UNC. The ouside thread is 5/16 UNF. Total length of stud 47mm. DCOE, DCO/SP, DGAS, DGMS, DGV, DGAV, DMTL, DMTR, IDF, IDA, DCD, ICH, DCNF, DRT, DFM, DFV, TLDM, DFT, DIR, DFEV, TL, DRTC, DFTH, IDAP, ICEV & many more.