structural bolts and nuts

The self-tapping property of these screws lies in their thread design. The sharp cutting edges on the screw's thread cut into the material, creating a mating thread as it is screwed in. This mechanism ensures a secure grip, minimizing the risk of stripped threads or loose connections. Moreover, due to their plastic composition, nylon self-tapping screws can be easily removed and reinserted without damaging the surrounding material, a characteristic that metal screws often lack.

...

The primary advantage of self-drilling anchors lies in their efficiency. Traditional anchor installation methods often require multiple steps, including drilling, cleaning the hole, and inserting the anchor. In contrast, self-drilling anchors combine these functions into one, reducing time, labor, and overall project costs. This makes them particularly advantageous for projects where time is of the essence or where access to drilling equipment is limited.

...