butterfly bolts

The installation process of an M12 chemical anchor involves drilling a hole into the substrate to the appropriate depth, then filling it with a specially formulated two-part resin. The anchor bolt is then inserted into the resin while it's still pliable, and as the resin cures, it forms a tight grip around the bolt, creating a robust connection. The curing time varies depending on the specific chemical composition of the resin, ambient temperature, and humidity.

...

Beyond its functional advantages, the Tek screw head also offers aesthetic benefits. Its flush finish when embedded in the material provides a clean, streamlined look, which is highly sought after in modern architectural designs and electronics Its flush finish when embedded in the material provides a clean, streamlined look, which is highly sought after in modern architectural designs and electronics Its flush finish when embedded in the material provides a clean, streamlined look, which is highly sought after in modern architectural designs and electronics Its flush finish when embedded in the material provides a clean, streamlined look, which is highly sought after in modern architectural designs and electronicstek screw head.

...