Hub is made from aircraft aluminum, and the coupler is made of steel.
JOES quick releases are pin-less and spring-loaded for fast steering wheel removal.
The splined steel coupling is bored to slip over either a ⅝” steering column.
Coupler only also available as a part.
Fits industry standard large 3-hole pattern 3 x ⁵/₁₆” on a 1¾” Bolt Circle.