Suits Scott, Merida and some others.
You can run a 1 1/8 steeer tube with this headset if you order the crown race for a Orbit Xtreme 1.5R (FS160-5464)
FSA part number 130-0001018010
Not sure if this is the one you need?
Check out the handy FSA Headset ID Tool here http://www.fsaeasyheadset.com/
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