This 1/4?inch chrome control dial knob with color jewel offers a polished replacement for old knobs in various heavy?duty truck cabs. Crafted from chrome?plated aluminum with a threaded base for secure installation, the knob features an embedded European crystal jewel available in a selection of colors. These knobs are sold individually and are designed to fit a variety of truck control shafts where a 1/4?inch diameter knob is appropriate. Backed by a warranty against defects in materials and workmanship from the date of purchase. Because these items are special?order parts, they cannot be canceled or returned once the order is placed.