6-8 4-9/16" Interior Jamb Side (JL491PRF) – Primed Finger Jointed is a precision-milled door frame component designed for standard 6'-8" interior door openings with 4-9/16" wall thickness. This jamb side provides a clean, stable surface for hinge mounting and door alignment, ensuring smooth operation and a professional fit. Manufactured from primed finger jointed material for enhanced straightness and dimensional stability, it resists warping and delivers consistent performance on the jobsite. Factory primed and paint-ready, the JL491PRF helps streamline installation in new construction, remodels, and door replacement projects.