Machined from billet aluminum, this polished aluminum shifter knob cover slips onto your truck’s automatic shifter lever. Featuring four grooves cut into the billet shifter knob, each groove is filled with a removable, black O-ring. If you don’t like the basic black o-ring, we have five different o-ring colors available to match your taste and style. This aluminum billet shifter lever knob will only work on GMC or Chevy trucks and SUVs with overdrive. Don’t settle for a plain ol’ automatic shift lever in your GMC or Chevy truck or SUV when you can dress it up with a cool billet aluminum shifter cover knob from AMI! If you want to add a stylish touch to your GMC or Chevy’s automatic transmission shifter lever then you need the polished aluminum billet shifter knob cover from AMI!