Shifter knob features a swirl-pattern  pearl  knob with a flat top, 2-1/8" diameter. Built-in 1/2-13 brass threaded insert. Made of durable Partek resin. Made in the USA.

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

Get the matching air brake knob, item 438658

• Turn your shifter knob into a steering wheel spinner with these adapters, item 366886