Set of 3 main burner control knobs for Spirit 300 Series grills, model years 2013 and newer (with "Up Front" controls). Dark gray knobs with a chrome finish top that features the red Weber logo. "D" shaped valve stem opening measures 1/4" in diameter. Genuine Weber Part. Fits the following models - 46510001 Spirit E-310, Lp, Blk, Gas Grill, 47510001 Spirtit E-310, Ng, Blk, Gas Grill, 46513101 (2014)(LP) Spirit E-310 w/Gbs/Griddle, 47513101 (2014)(NG) Spirit E-310 w/Gbs/Griddle, 46710001 (2013)(LP) Spirit E-320 Grill