LEGO® Arch 1 x 5 x 4 30099

LEGO® Arch 1 x 5 x 4 is a blue architectural part with a large curved opening, stepped outer sides, and MPN 30099.

LEGO® 1 x 5 x 4 Arch Part

This arch piece creates a tall curved opening while keeping a squared outer profile for surrounding wall sections. The stepped side shape gives the part a strong architectural look without needing several smaller pieces to form the same curve.

Useful Shape for Entrances and Curved Structures

• Large 1 x 5 x 4 arch format
• Curved inner opening for doorways, windows, and structural details
• Stepped outer profile for layered walls and raised sections
• Side and underside connection points visible for stable placement

Browse more LEGO® arch pieces or explore best-selling LEGO® parts for commonly used building elements.