Square frame-base

• Ductile iron.
• Non-slip surface.
• Black paint.
• In-ground frame.
• Security lock with key.
• Anti-theft bolt.

Class： C250/D400

1. Structural design: The square and round combination structure is adopted. The square frame is easy to install and fix. The round manhole cover body is adapted to the manhole, and the support structure between the frame and the manhole cover enhances the overall stability and load-bearing capacity.

2. Material performance: Ductile iron has high strength, good toughness, strong pressure resistance, can withstand loads such as vehicles and pedestrians, is corrosion-resistant and wear-resistant, suitable for a variety of outdoor environments, and has a long service life.

3. Safety features: The surface has anti-slip textures, which can reduce the risk of slipping when pedestrians and vehicles step on and run over; it has anti-theft function, can prevent displacement and abnormal noise, and can also prevent falling to a certain extent, improving the safety of use.