3 4 expansion bolt

The 38mm length is a popular choice for several reasons. This size is ideal for applications where a deeper penetration into the framing is required, providing increased structural stability. The longer length allows the screw to anchor firmly into the stud or beam, ensuring the drywall remains securely fastened. It is particularly useful in situations where thicker drywall or multiple layers are being installed, as it can penetrate through the drywall and engage the substrate effectively.

...

One of the main advantages of using self-drilling drywall screws for metal studs is the time-saving factor. With traditional screws, you would first need to drill a pilot hole in the metal stud before driving in the screw. This extra step can be time-consuming, especially when working on a large project with many screws to install. However, with self-drilling screws, you can simply drive them directly into the metal stud without any pre-drilling required, saving you valuable time and effort.

...

The installation process of chemical anchors involves drilling a suitable hole into the substrate, followed by the insertion of the anchor. The resin and hardener are then mixed, usually in a pre-determined ratio, and poured into the anchor sleeve or directly into the hole. As the mixture cures, it expands and fills any voids, creating a tight grip on the surrounding material. This chemical bonding not only ensures superior load-bearing capabilities but also provides resistance to vibration, corrosion, and temperature fluctuations.

...