The HTA key is keyed similarly to a T6 torx.AFAIK its either a torx or not a torx which is very specific
in design. Add a centre protrusion and its an anti theft torx
add or take away will call it a finger, and it's another brand
with a different name
Lets all agree manufacturers don't make fasteners and
anything not made in the U.S. is probably metric
excluding U.K. built vintage cars and bikes.