Rodney: UTC 70 is a 70 denier thread, roughly the same "size" as 8/0 UNI
which is 72 denier.
Cheers
Paul 
http://www.galesendpress.com
-- 
Paul Marriner
Outdoor Writing & Photography. Owner: Gale's End Press. Member: OWAA &
OWC.
Author of Stillwater Fly Fishing: Tools & Tactics, How to Choose & Use 
Fly-tying Thread, Modern Atlantic Salmon Flies, Miramichi River Journal, 
Ausable River Journal, and Atlantic Salmon.

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