Cylinder shape with a dome.Black color.Package Includes: 3Pcs guitar knobs. Whether you are jamming in the studio or performing on,these knobs provide precise control over your guitars and tone. Enhancing the look and functionality of your guitar with these smooth knobs for most electric guitars.Keywords: electric guitar parts,metal knobs,control. These control knobs push fit onto the 6mm(0.24inch) diameter split shaft of the tone and pots on your guitar.screw hole on the knobs,perfect used for your guitar and control the tone. Overall height of the knobs is 18mm(0.71inch) and is 17mm(0.67inch) in diameter.Please be sure to verify the pots diameter of your guitar before you order the item.