These Knobs are made of 7075 T6 Aircraft Grade Aluminum
They are 1.2"Long
and 0.750" Major Diameter
Tapered up from a 0.405" diameter at the threads
They feature 5/16-24tpi threads that are 0.650" deep with a .100" recess
The real item's color which you receive may varies from the listing picture because of different screen, and different light environment.