Schaller made the OFR's and many Jackson trems. and im sure some others
the difference between them is the Floyd has a hardened steel baseplate
Schaller's have a cast base with hardened inserts
Ibanez also used hardened inserts on most of their trems (Edge/pro/pro 2) that i know of (maybe more)
and they all used hardened post's
I dont know about the Kahler's but i would hope they used them as well
i have the Mighty Might but wont use it as a trem as it never holds its tune
but its not just the inserts/post's, its the saddles they bind up on each other.
the inserts suck and it has horrible post's to boot. plus the machining is junk at best
bottom line is a you get what you pay for.......$50 dont expect much
a Trem Setter is always a plus