Aluminum. For metal casement window. 9" steel contructed arm. 5/16" spindle, mounts on 3-7/8" or 4-3/4" hole spacings. Contains 1 operator with matching crank handle and mounting screws.
WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov.