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Petzl - Zig Zag
(Get this price if shipping outside EU)
A mechanical prusik for arborism.
The Petzl ZigZag was massively popular when it launch last year with keen aborists buying them up quicker than they could be made. The product recall which followed was a bit less popular however!
That is all over now however and Petzl have a re-designed version with a much stronger eye with an internal rubber insert to hold the biner in place.
More info on the Petzl site.
For use on 11.5-13mm EN 1891 type A rope.