The Prime-Line H 3557 jalousie operator is designed for use with a variety of jalousie windows, providing smooth and reliable functionality for both residential and commercial applications. This reversible operator features a non-handed design, allowing it to be installed on either left or right-handed windows for maximum versatility. Built to last, this diecast operator has an aluminum finish, ensuring long-lasting performance and resistance to wear and tear. Comes with a matching t handle operator, three adjustable link arms, and all necessary mounting hardware. Installation requires only a Phillips head screwdriver for quick and simple setup. Mounting holes are spaced at 3-7/8 in. or 4-3/4 in. on center, with adjustable link arms for customized installation. For further dimensional information, please see the line drawing and compare with your needs before purchasing.