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It is a specially
designed spiral grooved idler.
Groove is
filled with a soft insert that minimizes contact with the substrate and
improves traction.
The
groove insert can be changed with the idler mounted without the need of
special tools.
Much
lower inertia than elastomer spreader rollers. Able to handle low gauge
substrates
Easy
to clean. 
Very
low static generator. Good
performance in high temperature environments.
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