The Tooltech 4-in-1 Drywall T-Square is a must-have for all construction professionals. Made with high-quality aluminum alloy, it is durable and long-lasting. Easily foldable for convenient storage and features a laser engraved scale for precise measurements. With a 90/180 degree horizontal bubble, you can achieve perfect accuracy with a firm 0.5 degree seat. Includes a storage bag for easy transport.