These Knobs are made of 7075 T6 Aircraft Grade Aluminum
They are 1.620" Long
and 0.990" Major Diameter
Tapered up from a 0.410" diameter at the threads
They feature 5/16-24tpi threads that are 0.600" deep
and 8 staggered length flutes for extra positive grip without snagging
The real item's color which you receive may varies from the listing picture because of different screen, and different light environment.