6'8" 4-9/16" Interior Jamb Side – Clear (JL491) is a precision-milled door jamb component designed for standard 6'8" interior door openings framed with 2x4 walls. The 4-9/16" width fits typical finished wall thickness (stud + drywall), providing proper door alignment and a clean casing reveal. Manufactured in clear-grade stock, this jamb side offers a smooth, knot-free surface ideal for stain-grade applications or high-end paint finishes. Whether you're installing prehung units or assembling jambs on site, the JL491 delivers consistent sizing, reliable stability, and a professional finish for residential interior doors.