Truth Hardware (AmesburyTruth) Roto Gear (11 Series) 21-1/2" Single Pull Awning Window Operators (11.10.XX.211) are designed for use with complimentary Truth 13 Series awning hinges to permit a maximum sash opening of 15-3/4" (400.1 mm). Truth 11.10 Roto Gear awning window operators (also known as window cranks) feature easy disengaging of the window from the sash for quick window removal while an optional torsion bar can be installed to deflect the sash and improve corner sealing in wood awning windows. Manufactured with a high-pressure die-cast zinc case, crank handle, and knob, the Truth 11 Series awning window crank has a hardened steel drive worm and gear arms, in addition to a multi-stage EGard Plus coating process for superior corrosion resistance.