LEGO® Arch 1 x 2 Inverted (Part 78666)

The LEGO® Arch 1 x 2 Inverted (Part 78666) is a compact arch element designed for creating small structural curves and recessed details in LEGO builds. Its inverted design allows builders to form smooth transitions underneath bricks and plates, making it useful for vehicles, architectural details, and advanced building techniques.

Key Features

• Inverted arch design allows curved shapes underneath standard bricks.
• Compact 1 x 2 size suitable for small architectural details and vehicle builds.
• Compatible with standard LEGO® elements for stable integration into custom models.
• Part number 78666 commonly used in detailed MOCs and advanced building techniques.

This small 1 x 2 inverted arch is commonly used in compact builds where subtle curves are required.

Building Ideas

This inverted arch piece can be used for vehicle underbody shaping, decorative architectural details, curved supports, and small structural openings. Builders often combine it with plates, tiles, and slopes to create smoother transitions and compact curved forms in custom models.

Explore additional elements in our LEGO® Arch Pieces collection.