LEGO® Arch 1 x 4 is a curved structural part with four top studs, rectangular end supports, and an open underside arch, identified by MPN 3659 for accurate part matching.
LEGO® Arch 1 x 4 Shape and Structure
The part combines a straight 1 x 4 top layout with a rounded lower opening, making it useful for doorways, window frames, bridge details, decorative supports, and architectural builds.
Curved LEGO® Arch Part Details
Four-stud top surface for layered building
Curved underside opening for arch-shaped construction details
Block-style end supports for stable visual structure
