Not a typo, that's 1.00", perfect for a well-designed 6" f8. The spider is a Protostar 3-vane that will fit 6-7/8" id tubes, or larger if you use spacers. Condition is very good. Stainless hardware for spider is included. I think the diagonal is ULS Quartz but can't find the paperwork to prove it. Protostar's website now says that the diagonals are numbered but I don't see a # on mine; maybe they weren't numbering them when I bought this one 4-5 years ago. I recall ordering quartz, anyway, and I'm sure would have returned it if I got something different.
The diagonal has a tiny smudge or rub just off-center that should not affect images. I haven't tried to clean it for fear of damaging the coatings. I've tried to image it but can't get an image that shows the mark at all.
New cost from Protostar for these components is about $150 + shipping. I'm selling cheap because of the mark on the diagonal (even though it won't affect images!) and because I can't find the paperwork I received with the diagonal that verifies quality. But Protostar warrants all their diagonals for very high quality.
I usually prefer all sales to be final but since I'm missing the paperwork and no serial number, I'll make an exception here. If you buy it and find it's not what I say it is, or the smudge is more than you can live with, return it and I'll refund your money less shipping. Tough to beat that!
Buyer to add $7 shipping, US sale only please. Will not separate diagonal and spider.