52 mm coring for anchor bolt 

Coring for anchor bolts refers to the process of drilling or cutting a cylindrical hole into concrete, masonry, or another substrate to install anchor bolts where they were not cast-in-place during the initial pour. This is a common technique in retrofit or post-installed anchor applications.

When and Why Coring is Used for Anchor Bolts:

1. Retrofitting structures – When new equipment or structural elements are added to existing concrete.
   
   

2. Design changes – If anchor locations change after the concrete has cured.
   
   

3. Accuracy – Coring ensures precise hole diameters and depths, which are critical for anchor performance.

coring works for an exhaust fan 

To create a precise circular hole in a wall (usually concrete, brick, or block) to install a wall-mounted exhaust fan or a duct sleeve for ventilation.