Truck shifter knob  with etched Punisher skull design. 2-1/8" diameter. Built-in 1/2-13 brass threaded insert. Made of ultra durable Partek resin. This  semi truck interior  accessory is made in the USA.  

Matching Tractor/Trailer Air Valve Knobs, item 319905, sold separetely.  

See more link for Installation Instructions.  
Installation requires shifter adaptor.  Choose 13/18 Speed, item 238690 or  9/10 Speed, item 238691, sold separately.