Set of 3 main burner control knobs,"D" shaped valve stem opening measures 1/4" in diameter. 1.Set of 3 Control Knobs 2.Compatible with Weber Spirit 310/ 320/ 330 (2013-2017) Series Gas Grills with "Up Front" controls. 3."D" shaped valve stem opening measures 1/4" in diameter. 4.Installation is as simple as removing the original knob (do not bend the knob up or down) and replacing it with a new control knob. 5.Please Confirm the Model before to Buy
