Marvin ( Old Style ) Case-Master Casement Operator Crank Cover and Handle - WHITE  OR BRONZE ( please specify color at checkout in the comment section )    If color is not specified at checkout we will process order as the Bronze 10898231 , 10840025 - Marvin Casemaster windows are a legacy casement design known for their smooth crank‑out operation, durable hardware, and energy‑efficient performance, offering homeowners reliable ventilation, tight weather sealing, and long‑lasting fiberglass or aluminum‑clad construction that continues to make them a top choice for replacement and repair projects.