Self-Lock, 5:1 Gear Cranks, Chain Pull

Manivelles à verrouillage automatique, rapport de vitesse 5:1, traction par chaîne

Gear cranks, 5:1, self locking, chain pull (20' of chain).

Super reliable, we have sold the same unit (with some improvements) since 2003. Can be used for: small runs of rack and pinion vents, ridge roll up systems, roll up vents in gutter houses. Ideal for exterior light deprivation and retractable shade systems. Installation hardware sold separately.