E-Z LOK 450-6 M6×1.0 solid refill inserts with metric exterior

Check compatibility
E-Z LOK 450-6 is a solid refill with M6×1.0 inside and M10×1.5 outside. This pair differs from the M6 kit that uses a 3/8-16 outside thread.
Questions before ordering
Does every E-Z LOK M6 kit use this refill?
Check the exterior specification. This refill uses M10×1.5 on the outside, while EZ-650-6 uses a different outside thread.